After you use the LE code and the game unlock the bonuses, you will get XP (+5200XP I getted once, maybe it's the same amount always) every time you restart the game, when the Warning message appears saying that your LE bonuses are unlocked. This is because you get the XP for reaching rank 5 every time you restart the game, I think.

Sweet!

Actually, no it doesn't. I've had the Unlock message every time I logged in, but that was when my copy of Crysis 2 was in an earlier patch.

If it did repeatedly give me 5200XP every time I subsequently logged into multiplayer since entering the bonus for the first time, I would have been in the high level 30s by now form doing this alone, but atm I'm still lvl 19 due to my lack of playtime on this game

i still get the unlock message every start-up, dunno about xp though.

I have PC version. And I have the last patch because I bought the game from Steam; it's always updated. I just unlocked the code about a week ago, so with patch 1.4. I keep receiving extra XP every time I start the game. It's just only me? Or I keep receiving XP after leaving the online servers?!? Like in Starcraft 2. Anyone else?
I don't know if I can make a recording for youtube, but I'll let you know if it's done.

Sorry. It's no extra XP. I receive it, but when I go online in a multiplayer game, the extra XP is gone.