Recently, I installed two, QUAD SLI, EVGA GTX 590. I ran 3dMark 11 which included tessellation. Oh yes. DX11 is gonna task some systems. In one 3dMark 11 test (i'll have to run it again to get the name) my frame rate bounced around 10-15 fps. Yes, these test are probably not what we will see in Crysis 2 with patch 1.9, but I'm just saying keep the whining to a minimum and dont faint. lol Be careful what you ask for.
Crysis 1 is an amazing game. But it was beyond many PC systems because it was computationally intensive. This is one of the reasons that made Crysis 1 so attractive.
No doubt Crysis 2 will run fine at current settings on a broad range of systems, see link for your PC rig. With the "Patch", the wonders of tessellation etc, immersion gaming, may not be compatible with your card, or may push your rig. Nonetheless, present settings should still be a standard to keep you pawning.
Looking forward to seeing your dimples next week.