Here's the announcement by Fox*. (Added bonus: why it's all about Dollhouse.)
Plus, the news from ABC (bonus: V returns!), NBC, and CBS. And yes, the CW is still around. (Bonus: includes vampires.)
For the quick hits, you can check Ausiello's cheat sheet.
[ADDED: handicapping ABC's new shows. 11:35 am]
* - I was shocked to uncover that I watch Fox more than any other network channel, as they have Dollhouse, Bones, and House. The latter two are entirely M.'s fault.