Let's share what changes or features are new in the game. Let's not take these for granted yet as these features may be changed when the game goes live. So here goes :
1 )Reia posted about changes in mobility.
http://www.cosmicbreakfanforum.com/t15000p90-closed-beta-test-schedule-updated
2) You can level up your bots by feeding other of your bots to your preferred bot (parts won't be consumed. Just the Core).
3) Seems like you need to buy carts (guard carts, mobility carts, etc) in the shop and have them equipped to your bot.
4) Bots are ranked A,B,C,D. Bots need to be ranked up in order to use other carts -- this info is unconfirmed.
5) You cannot get out of an arena match once the countdown starts -- I tried different keys to get out but to no avail. Can anyone confirm this further?
6) There are 2-handed weapons which can be equipped in the game.
7) Some function keys in CB are still present in CB2. F1, F2, F3. Camera angles like, Alt X, Alt Z, Alt C works too.
Ammo will refill during battle and the refill speed is will depend on what type of weapon you're using.
9) No healers!
10) You regain some amount of HP when you kill a target.
11) No bouncing tits! (As of yet, maybe)
These are the things I've noticed so far. Feel free to correct or add anything else that you noticed new in the game.
