RV770 chips are looking good and the highest end R700 based product might launch around Computex (starts at June 3 2008). We believe it will actually be a few days earlier, but it can as well be a few days after.
The chips and cards are supposed to be available at launch date and ATI is doing the logistics part better than ever before. RV670 was a great product that raised many eyebrows, and as Jon Paddie said in one of our correspondence, Nvidia had to launch a few products around RV670 to counter it.
We've seen that many G92-derived products including 8800GT, 8800GTS, 9800GTX and eventually G94 (D9P) – 9600GT who made RV670 runs for the money. Despite that, ATI sold all RV670s it produced in Q4 2007 simple as Nvidia couldn't pump enough G92s. Nvidia cards were faster than Radeon 3870 and 3850, but ATI was a bit cheaper and had a good price / performance ratio.
The new R700 is based on two RV770 chips, and as far as we know in most of the applications, it should end up on average 50 percent faster than RV670. It looks promising and May looks like a great month to launch cards. It will roughly take place one year after heavily delayed and criticized R600 launch. It looks like a nice launch is just months ahead of us.