Honestly, and this applies to all updates on any system: wait a month. Developers will move over their apps. Any major bugs will be found and shook out. Stackoverflow/blogs will be populated with answers on "how do I do $thing_that_has_changed"?

And B, upgrade a non-essential machine first. The only thing you gain by upgrading willy-nilly is Internet e-peen points, and after a while you realize those aren't worth losing a day or week or month or year's worth of work (hello rsync -E) to being the first mouse. Yes, this isn't as exciting. As for me, I like my systems very very boring.