For medal of honor? Try their website and see what the responses are. I am pretty sure you need to pre order and that comes with the beta code and download, but not 100% sure on that.
Is the beta any good? Isn't the MoH and Crysis 2 release dates at the same quarter? I don't see the point in me getting the game then.
Still would like to know how the beta is going, as it's really similar to Bad Company 2, and that is a game I have been enjoying while I wait for Crysis 2. =)