[Starting] June sometime. No actual dates yet or whether they are all going to be available on a given day. It'll be interesting what the retail availability is going to be as these are also meat&potatoes mass-market OEM cards so I'd expect guys like HP, Dell, etc. to be getting sizable allotments.
I should've jumped the gun when I saw that thread when the 2900 just came out and it close to like $340. Too late now. And I don't think my Seasonic 600w power supply can handle two of those in crossfire mode. I'm just crossing my fingers for the lower-end cards.