There's are large release section at the top of the right column. It's given more real estate now than the simple link that was there before.

They also placed the 'About' on the side bar which of course messed up the mental model for lots of Github users, judging by the comments here.

I don't really use the releases section (don't recall it existing, to be honest), but right now it's among the first things I saw when going to a repo. It's in the new sidebar.

This is my largest complaint (so far), since it was something I was looking for on a project just after the release.