A poster at the Xbox.com forums claims to have posted a leaked list of all the updates that will be featured in this Fall’s Dashboard Update. Included in the update will be 3rd party wireless support, a new XBLA blade, new clan support, new XNA game launcher, Chatpad functionality, and DivX support, as well as many other features.
The new spring update will enable Windows Media Connect or Media Center streaming MPEG-4 up to 8Mbps, H.264 up to 15Mbps, and PlaysForSure WMV videos (and, as we understand it, PlaysForSure audio as well)