There are current owners of DX11 cards that will expected to play the game in DX11 now if it's listed on their site. Some people are very anal about false advertising believe it or not, i.e. 10AM C2 activation time. The GTX 590 was scheduled to be released on 3/22 and was pushed back for driver reasons, so the DX11 patch was "probably" pushed back also, so they had to remove Crysis DX11 from the site.
Then you see some advertising left over for DX11 here: