I also noticed a recent battery drain.. normaly my battery lives for about 40+ hours but now batterygraph showed me it had lived for about 12h. I checked "dmesg" in terminal and it showed:

"dspbridge: timed out waiting for mailbox" and looped that message. I also found some strange processes in top like "kondemand/0" and stuff. The vibration when i clicked the screen was wierd. I am not sure why this happens but i tried "modprobe -r dspbridge" and it stopped. Problem is that i need to do this now everytime i reboot.

And by unloading the dspbridge module i probably will encounter some other problems.. like camera or other graphical functions. I have not noticed anything yet.

By using Stkeeps battery diagnostic script (think it was Stkeeps) i have noticed a significant raise in battery use while idle.