Via the CS:GO blog:

Rumor has it:

- Wish to opt in? Right-click on CS:GO in your Steam library, go to Properties, go to the Betas tab, then select "1.35.4.7rc2"
- If you don't see this branch offered, restart Steam
- To opt in for servers: run "+app_update 740 -beta 1.35.4.7rc2" in SteamCMD
- As was reported previously, some features that rely on Valve's servers may be unavailable

- SteamDB GameTracking services will be completely unavailable as it only keeps eyes on the public branch - be aware, but even if it did keep eyes on alternate branches, there likely wouldn't be anything of particular significance with this update

- Size opting in directly from RC1 is close to 10 MB, size opting in from the public branch is ~15 MB

- You should also be aware that the Steam Subscriber Agreement was amended as early as late on 9/9/16, which includes minor language alterations to a clause dealing with beta/prerelease software
- You can view the rest of what changed involving the new SSA here, which now includes a dedicated COPPA clause (no users under 13) which may or may not have been sparked by recent scandals, and clarifications for dispute resolution in the European Union
- Use of the prerelease branch, as well as continued use of the rest of Steam, constitutes your acceptance of the new terms

It's been in RHI for a little while now.

Via HLDS:

Rumor has it:

- sigsegv__ (everyone's resident responsible bug reporter that allows Valve to take them out back) provides some additional insight on reddit into the flamethrower griefing bug that was fixed

- Only thing of real note in this GameTracking diff is the fact that the TF2Maps 72hr TF2Jam Summer Participant medal is now nameable, and a typo was fixed in The Black Watch's description, where "battalion" was misspelled as "batallion"

- Those changes are also reflected in the item schema update as well: https://github.com/SteamDatabase/SteamTracking/commit/1c958a9b23c1e3fb4884d224eba618955ad76745

- Size is ~15 MB

Via HLDS and the Steam store:

Rumor has it:

- GC protobufs, and low-level things involving kicking people from lobbies: https://github.com/SteamDatabase/GameTracking/commit/3330f186c385e004f1ac16d7ce079d0a3eabbbfe

- This update is labelled as OPTIONAL for server operators

- Size is ~35 MB

Via the CS:GO blog:

Rumor has it:

- This prerelease update is a historic first for CS:GO, as it appears Valve has listened to those that want a beta branch in some form

- Wish to opt in? Right-click on CS:GO in your Steam library, go to Properties, go to the Betas tab, then select "1.35.4.7rc"
- If you don't see this branch offered, restart Steam
- To opt in for servers: run "+app_update 740 -beta 1.35.4.7rc" in SteamCMD

- SteamDB GameTracking services will be completely unavailable as it only keeps eyes on the public branch - be aware

- Size is ~15 MB

Via HLDS:

Rumor has it:

- Medals for Tip of the Hats 2016 donors are divided up into three tiers: Jaunty Camper 2016, Jaunty Benefactor 2016, and Jaunty Trailblazer 2016
- Interested in making a donation? Head to http://tipofthehats.org/ for details

- Here's the rest of the item schema update

- New strings, and an early look at an upcoming item schema update: https://github.com/SteamDatabase/GameTracking/commit/51d7e79438331bad7cdb414a56f79edf4af48408

- Size is ~35 MB

Borders: dog shit at their best, dog shit at their worst. It's essentially one giant standoff where everyone has a gun pointed at everyone else.

Watch as they update mid-tournament.

Via HLDS:

Rumor has it:

- There was an item schema update though that modified Pomson 6000 attributes and adds Bonk! Atomic Punch's description to its Festive variant: https://github.com/SteamDatabase/SteamTracking/commit/1416e1951746bfcbda4d26a0c313ce846f7c3da5

- Size is ~5 MB

Via the Steam store:

Rumor has it:

- vJill states that even despite a fix for OOM on Mac OS X/Linux, the OpenGL renderer used on those platforms still has a rough time with memory pressure. Recommendations include upgrading to Mac OS X El Capitan (10.11), and particularly on Intel HD Graphics, lowering texture resolution; Linux users should use 64-bit distros when possible and also use the newest mesa driver stack
- sigsegv__ revealed in a conversation with Valve that JohnS mentioned that it was discovered in CS:GO's branch of Source as well, and that this same fix should arrive there "shortly"
- vMcJohn clarified that this fix was stealth-shipped around a week or so ago in CS:GO

- Some MvM challenge names are now Properly Capitalized: https://github.com/SteamDatabase/GameTracking/commit/59b15e87aca56a4ac3d2e01efd88b9ae0a18285b

- And it looks like localization files for non-English languages got updated too

- Size is ~5 MB on Windows XP(!)/Vista/7/8/8.1/10, except close to 10 MB on Mac OS X/macOS

Robots aren't capable of possessing crushes on the scale of TobiWan's Drow crush, are they?

Here's a blog post with Valve's images of the new Gamma 2 Case items: http://blog.counter-strike.net/index.php/2016/08/15510/

--------------------------

Via the CS:GO blog:

Rumor has it:

- CS:GO Stash is filling in details of the new Gamma 2 Case items here as they start to stream in
- Here's the full item schema update

- Strings for the new Gamma 2 Case items, and script changes for the Glock/P2K/USP-S/Deagle sound changes: https://github.com/SteamDatabase/GameTracking/commit/862c093845438d457438a6a8935ec25721d373bf

- If you're intending on reporting issues (don't be afraid, you never know if you're not the only one!), and you happen to be on Windows 10, please make mention of whether or not you're on Redstone 1/the "Anniversary Update" as not all issues may be caused by this update itself (or the previous one), but by Redstone 1
- Unsure of whether or not you're on Redstone 1? Search for "winver", and if "OS Version" is 1607, you're on Redstone 1. Otherwise, if it says 1511, you're still on Threshold 2
- It's strongly advisable though that due to how bug-riddled Redstone 1 continues to be that you take any and all available steps to hold off on the Threshold 2 to Redstone 1 jump for a week or two while issues are slowly but surely fixed
- I'll leave this notice out by mid-September as most Redstone 1-related issues should have been ironed out by then, either by Microsoft or by you

- Size is close to 70 MB

Sounds a lot like the Steam Datagram system to me, which was ported to CS:GO from Dota 2 during its Winter Update in December 2015.

Via HLDS:

Rumor has it:

- At some point in the future (possibly as soon as today based on this blog post), you may start getting notifications for when players are banned based on your reports as is done with CS:GO (when it works, which is rarely as of late) and Dota 2 (where it works 9 times out of 10), as based on some low-level additions and string additions too
- You might even be notified mid-game when a player you report gets banned per geel9

- A lot of low-level changes, and a couple of string changes: https://github.com/SteamDatabase/GameTracking/commit/94c2ae28ff66219218137c1caf117138fb61625c

- Size is ~65 MB

Via the Steam store:

Rumor has it:

- Strings and HUD file updates: https://github.com/SteamDatabase/GameTracking/commit/15f425bbb7a4d81df5bcf106e9309634ca09c655

- It seems that Valve has already declared Pyro as the winner
- Yes, you're not blind, "Pyro" is apparently called "Pryo" now
- As also hinted by this comment in the warjoinpanel HUD file: "// Sorry Team Heavy. It looks inevitable at this point"

- Size is ~20 MB