Another place where GitHub is really dropping the ball is in the social aspect of their service with terrible activity feeds I can’t believe anyone actually uses. I wrote a rant about it here: http://pygm.us/uGhNdcGU.
There are many, many ways Bitbucket can beat—and beats—GitHub, so this new design makes me a lot more optimistic about the continuing competition between the two and the improvements this will result in on both sides.
I will say that I’m not sure whether I like a grey as dark as the one you use in your new design, though. :)