Where can I find links to info about the new Dark Sun 4E material?

I'm excited to see that I can play a Mul or a Thri-kreen in 4E Dark Sun, but I'm wondering what other "goodies" have been revealed so far. Anybody have any links about other races, character classes, etc... or any other info you wish to share? Much appreciated (and yes, I know it's not strictly "Planescape" related, but I think it'll be cool to add Mul and Thri-kreen PCs and NPCs to the streets of Sigil... especialy Thri-kreen since they look so different!