Hopefully DP2 in a few hours time. There's so many bugs on the current DP1 that even Mavericks DP1 feels more stable and superior than this El Crap...
It's a solid beta - runs well, but chews battery. At least on my 12" rMB. I look forward to the next beta.
Check your console to see what's leaking. A few people were seeing a lot of iCloud issues and that was burning the battery life as it kept pushing the network. Once they've deleted the account and re-enable it, the battery life stabilized.
No battery issues here so far but I did a clean install and didn't get any iCloud issues.