GameSpy had an interview with Eric Lagel, the director of Crysis.
GameSpy: One of Crysis' big features is the nano-suit and its variety of powers. First off, how will nano-suits work in multiplayer, since they are persistent in single-player?
Lagel: The nano-suit will work in multiplayer the same way it works in single-player: it grants players instant and decisive means to overcome opponents. There are various ways of using the suit in multiplayer, and once you've tried it, you won't want to go back to standard modes.