Battery life seems about the same as most other betas... haven't really used it much today though. I did notice that most of the time it has switched to EDGE instead of 3G. Very annoying. This is probably why it affects my pc speakers the way it does. I can't remember ever seeing EDGE mode with the previous build. I've turned the mobile network off and on a few times and can't seem to get 3G mode at all. It was in 3G earlier today though.
Memory seems a bit better. The phone functionality seems a bit faster, but I never really calculated the load times so I'm not really sure. These results may be psychosomatic.