I think it will, but I looked at some old pre-order charts and I feel like it may not sell as much as expected/significantly better than MW2.
I'm a total noob at this site so I just made the table myself and copied the info.

So MW2 is actually ahead by around 70,000 units, which isn't really a lot, but should that lead me to believe MW3s numbers will be close to MW2s and won't sell more than Black ops? Am I giving too much credit to pre-orders indicating overall sales? 

I voted for cool story bro.

cool story bro.

That's not cool bro.

MW3 will sell more than MW2 and Black Ops.

it will be the highest selling game of all time. You can quote me on that.

MW3 will be the highest selling COD.

no,that's what I said. lol

xD I didn't even see your reply.

I was joking.