Heads up for anyone who doesn't know - EA have made a boob again. You can unlock Crysis 3 using a far eastern VPN.
I've just played the 1st 5 minutes or so of the single player and its a bit of a resource hog, it looks fabulous for it though.
On my system with my 7970 clocked to 1050/1500 I had to knock the settings down to 'High' (from 'Very High' which it defaulted to), also turned off motion blur and AA. Outside I was getting about 30 - 35 FPS, inside I'm looking at 50 - 60 FPS. But I must stress this is only the 1st 5 minutes of gameplay - it was mostly just a heads up to say - Go and play it