so today available to developers is ios_4.2.1_gm_seed__iphone_4__8c148.dmg

am downloading now to see what changes they will have made, why? is being asked on the dev forums with not much of a clear answer. so lets see how long it takes for official release now.

-edit- Apparently this may resolve some Exchange, VoIP and audio issues.

btw DannyBoy.. if you do option+check for update.. it lets you update to the latest GM and you dont have to restore