It's still early to talk about FreeBSD 9.0 release but so far there have been some interesting developments in the systems and a nice core featureset is shaping up. I'm still maintaining the "What's cooking" page and this post is basically an (incomplete) summary of it at this point in time.
Of course, in addition to these features, there are non-stop modifications to all parts of the system, from drivers for new hardware to overall performance enhancements.