Some interesting things I noticed:
Render.Drawfps 1 doesn't work anymore. The command was changed the to PerfOverlay.DrawFps 1
MSI Afterburner's OSD won't work because it only supports 32 bit games and the BF4 beta is 64 bit only.
FOV can be set as high as 120 now.
Your FOV doesn't lower when you ADS with the red dot sights. Haven't tried iron sights yet. EDIT: that was a specific scope. Other scopes work normally.
With the 2x magnifier sight on the Support rifle, zooming in doesn't seem to scale sensitivity, so aiming is kinda wonky. Reminds me of ADS in Bulletstorm.
On the spawn screen, instead of seeing your selected spawn location in real time in the background, you see it in a small window at the bottom of your screen. If your selected spawn point is a squad mate, then it shows his first person view. The rest of the spawn screen is a big commander view of the map. You can now spawn on locations by clicking it on the map rather than guessing names from a list.
Lots of positive changes. Really liking the game so far.
Edit: Comp Specs -
CPU: Intel i7-980X @ 3.33 Ghz
GPU: Nvidia 680 GTX
Ingame settings: All low + lowered resolution
Average FPS: 40-60