Can you give me an idea about the differences? I know I can google it, but I try to avoid that NSA crap :/
The biggest one I'm looking forward to is the stabilization of btrfs. Other than that, though, I think it's mainly an evolutionary release. I typically reinstall from baremetal, but when I went F18 --> F19, I thought I'd try to fedup (Fedora Upgrade) process. It worked well, but my system now has leftover stuff from two versions (stuff I install to play with, then remove--leaving old dependencies behind), so it's time for a fresh metal install.
(Psst! “ixquick.com”. Better. Faster. No ChiCom-FanBoi of a search engine!)