We've confirmed that RV770XT and PRO will both end up with Radeon 48x0 names. It looks that RV770 might end up being called Radeon 4850, but we still cannot confirm whether RV770XT is Radeon 4870.
ATI sent out the notice so the partners can design the boxes, and it looks like they will all be ready for a late June launch.
ATI will be ready to sample in the week that starts with 16th of June, but we’ve heard that they might push the final review date a bit later; but not later than the week after.
That was the original plan, and at least we know that RV770PRO is Radeon 4850.