My favorite bit so far:
Q: Why should I buy MW3 instead of Battlefield 3?
A: You should be buying both because they both will be stellar games. I refuse to say one ill word of Battlefield 3 or DICE because I think they're both fantastic and am good friends with several of the guys on the team.
If you are a shooter fan, they are both fantastic games to own because of one reason. They are different.
Each do their own thing in a fantastic way and it is refreshing to have the option for both styles.