Via HLDS:
Valve- Added the Summer 2019 Cosmetic Case
- Contains 22 new community-contributed items
- Added tournament medals
- Fixed and exploit where pipebombs could not be destroyed or pushed by the enemy team
- Fixed Medi-gun/Wrench items not dropping for the Mann vs. Machine rewards
- Fixed not seeing the team-goal hints during Casual matches
- Fixed a scale problem with the Brazil Fortress Halloween medals
- Updated the localization files
Rumor has it:
- Inventory images and Steam Community Market links for the Summer 2019 Cosmetic Case have been put together in a nice list here made by /u/DukeBruno123
- Said localization file updates, which are made possible in part by contributions from Translators Like You - Thank You, can be found here: https://github.com/SteamDatabase/GameTracking-TF2/commit/8c3b7adf89bdc8c72401f81b3dba472c4fc91890
- This update breaks another new all-time long drought between updates, which this time lasted 72 days (the previous update was on 5/14/19)
- The previous record was 63 days, a stretch earlier this year from 1/22/19 to 3/26/19
- As well, this is just the *9th* update of any kind for the game so far this year
- Size is ~20 MB