What does the 2.0 update bring?

I have twenty twelve 1.9 and I’m using a child theme, and I was wondering what’s new in 2.0. I can’t seem to find a list anywhere.

I’d like to know what the changes are, before updating. I know, that there’s no real risk, when using a child-theme, but it could still change things I’m happy with.

Thanks. ??