Level 3
As far as I know, the PEGI and BBFC have not yet officially rated MW2 yet.
Personally I would have thought it is highly possible that the full game will receive a 16+, as COD4 is rated 16+ by PEGI. And apparently, unlike COD WAW, according to comments made by 402 during an interview, Infinity Ward are sticking to what they had originally in COD4 with regards to blood and gore in MW2. There will supposedly be very limited blood and gore, and in COD4, Zakhaev's son shoots himself in the head, there is a firing squad where innocent civilians are killed, etc, and it still managed a 16+. Don't take this as absolute truth, but I think that it's possible that MW2 could get a 16+. Obviously it depends on what else is included in the gameplay and cinematics, and whether blood or gore that may make it into the game is exaggerated.
It'll definitely be a (BBFC/PEGI) 15/16+ or an 18/18+ (or some weird combination like 18/16+)
But we don't know yet, as soon as it's definitely rated it'll be on the PEGI/BBFC websites.
Hope that clears it up for you. 
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