AMD will also ship 53xx, 54xx and 56xx graphics cards in the next few weeks, and the 800-series chipsets' IGP is confirmed to be DX11. So they will have a complete DX11 lineup this quarter or early next.
Nvidia will launch their high-end card (should retail for much more than the 5870 given its 60% bigger die size) in late March by all indications. That's one chip. Derivative parts will be like 4-6 months after that, and if they screw it up like they did with GT200's derivatives then it could be 1 and a half years after (GT200 -> GT215/6/8 was 18 months delay because 65nm GT200 never had derivatives and GT212 was cancelled) and still not complete (still selling G92s in the $100 - $150 range).
They seriously need better organisation; we need Nvidia to bring down 5xxx prices to RRP or below.