This as far as I can tell applies to those who've submitted their code and have received confirmation of it and the confirmation email. It also mostly applies to if you have played in the beta (my situation), I've just thought of it now although other people may have as well.
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If you've met the requirements above: Activated code and have confirmation of it, yet it still doesn't appear in game and you are using the same account that you have in the Crysis 2 multiplayer demo. Simply create a new account ingame that uses the same email that you used to activate your Limited Edition content.

eg: Logging into Crysis 2 'account A' with 'email A' that you used in the beta isn't giving you your Limited Edition content activated on 'email A', create a new account 'account B' still using 'email A'.

I've probably explained this a bit too much, but I'm trying to make it as simple as possible. I hope this works for anyone else as it has to me.


EDIT: By the way this is intended to help PC users but I posted in the wrong section .