Well, I did some digging and found a great little picture on NVIDIA's own website. I've posted this picture above and the tag for it says:
Built for DirectX 11 - Enjoy all the visual glory of the latest DirectX® 11 blockbuster games like Crysis 2, HAWX 2, and Civilization 5. With massive geometry processing power of the GeForce GTX 560 Ti lets you enjoy incredibly detailed environments and characters.
Now, this is kind of shocking - it's also misleading and finally, false advertising. NVIDIA paid Crytek $2 million last year to provide something for NVIDIA users, what that is - we don't know. Delayed DX11 for NVIDIA cards? Maybe. TWIMTBP support? Maybe? No one knows, but we now have direct-from-the-horses-mouth confirmation that NVIDIA considers Crysis 2 a DirectX 11 title.
Let's see how long it stays on their website.