This game is going to be huge. I saw at least 6 commercials tonight during both NFL games, and they were not short at all. Besides the Superbowl and maybe American Idol, those are the most expensive commercials out there.

Maybe it's part of the agreement for the transfer of publishing rights

For those who haven't seen it:

Definitely EA. Good commercial though, I think it's impossible for me to want a game more than this

it was EA.

This thing has GOTY written all over it...I think the Week 1 numbers are going to stun us all!

Its EA if it was paid by MS we would have seen this at the end....

EDIT*

This is a good example if MS paid for the advert.

Agreed EA used their ad budget and it probably will end up being well spent considering the lucky timing with the game situation. Also if MS would have paid for that beyond them requiring just the Xbox jump in screen they probably would have thrown in the console picture that says starting at $199 (like when they were advertising ODST, Forza 3, etc).
Another possibility is that they did pay partially pay or subsidize the ad, but the visuals were taken from the PC version and they vary enough that therefore if would be false advertising to throw in the 360 jump in screen.

Just a note if you go to www.xbox.com and watch the "launch trailer" that is on the home page, it also does not show the Xbox sequence at the end which is unusual for any game trailers on the xbox site.

Same thing. Where do you think that money is going? To help pay for the advertising. 

Not necessarily. It depends at what point the agreement was made, and whether it raised the original estimated costs of the game's advertising or not. If it didn't raise the costs or add more money back into advertising, then it's just pocketed money.