Hmm. I just did a git clone. I thought it would be the latest stable release (I'm not that familiar with git).
It would explain why I couldn't find any release notes
For sure! ;-)
Hopefully this doesn't indicate a bug in 0.12.
Possibly they are just enforcing the rpcallowip option if they haven't before. Though localhost might be enabled by default and it may indeed be a bug *shrug*
Edit: Hmm, looks like rpcallowip is only for unauthenticated RPC connections? Oh well, I'm sure they'll sort it out before release. Quite possibly they're doing something clever like encrypting the rpcpassword.
I did notice they're letting the useragent comment be specified by an option which could make things interesting.