Call of Duty: Modern Warfare 3 isn’t out until the 8th November 2011. If you were a dog, that’d be nearly two years away. (Also if you were a dog, you’d have real trouble with some of the button combos when it did arrive.)
Good news, though: you’re human, and can therefore get yourself to Birmingham’s NEC from 16th-18th September for GAMEfest, where you’ll be among the first to play MW3. You’ll need to grab a ticket in advance from Game (if you’ve got a reward card already, you can just go to its site), then it’s just a question of passing the time until the big day. May we suggest you wag your tail in happiness?