Exactly my thought. @RealMonster which iPad is this and what's its age? It might be a one-off thing as well, you can always charge it back and check again.
I haven't, and the battery drain seems to be gone for the moment. But at the time, it was an overnight drain, so I wasn't able to see if it was warmer than usual.
Either way, I filed a bug. Hopefully the iPad diagnostics will give them something to work with.