I haven't come across any comprehensive list of changes but:
Here are shots of achievements, stats, and the end of round stat thing.
http://forums.steampowered.com/forums/s ... ?t=1263977
People have said the movement is more fluid when jumping and the speeds are like 1.3 but I haven't noticed any change.
Turning around quickly makes a footstep noise now. (Even if you're holding shift to walk)
The beta was available to owners of CS:S but as of now, they've reached their limit and the beta sign ups are closed.

