The first Firefox 3 (Grand Paradiso) developmental milestone, Alpha 1 is set for next Tuesday, November 28th. Not really sure yet what features are going to be a part of this milestone. I have heard over at CyberNet: Firefox 3 To Have Advanced Microsummaries and it will be Acid 2 compliant. But that is about all I know for now besides the fact it will be built off the Gecko 1.9 trunk (Minefield).