Idk, have they ever done something like that before?
It didn't take them very long to release the 4000 series after they 1st released the 3000 series.
Edit: @ fakebird
The ATI 5870 is a very nice card and it is the card of choice at this moment in time, in my opinion
The Gtx285 is Nvidia's top-of-the-line single gpu card, which the 5870 out performs. The Nvidia gtx295, which has two gpu cores on it's one board, is pretty close to the 5870 in performance.