Under "My Crysis" in the in-game menu it says you will be "given access to statistics and leaderboards online" aswell as "ability to compare your gameplay performance with your friends and the rest of the world".
The stats and leaderboards will be available in the not too distant future, keep an eye out for more information that will be posted into the forums nearer the time.
when it initially asks to enter gamesas details in the game, it only asks for Sign Up.. since i already have a gamesas account and used the same mail which i had given here, will my gamesas account be linked to my PSN id or some other new gamesas ID be created?