The only problem I've seen is the new bug in the SDK in initializing gamepad references described at this link:
http://ftcforum.usfirst.org/showthre...pad-References
If a team is trying to use the gamepad references when an OpMode instance is constructed, in the init() method, or in the init_loop() method, the new SDK will throw an error because the gamepad instances seem to be instantiated later in the new SDK than they were in the old one. The workaround reported in the thread seems to work.