Kept quiet checking this thread to see how the story develops, but I feel I need to chip in few things now..
- In my experience, what's causing battery drain, and high usage over night, where there was actually no usage are rouge network connections, open sockets that attempt to send data but for whatever reason, either don't understand the answer or the process controlling them is hanged. These connections...
v0n, are you an iOS dev? It'd be great if you could file a bug directly over at Apple's dev site as they seem really responsive right now. I have no idea how valid your theory is, but it certainly sounds promising!