I meant to post this earlier, but will do so now.
I think one thing to look at is the price on the Canon USA site, which currently lists the 7D at $1,699. To me, that indicates that Adorama and B&H have about $220 (from the current $1,479 that they are selling the 7D at) to play with when rebates get announced. They can raise their prices up to the manufacturers suggested retail price, but they probably won't (maybe can't) raise their prices above what Canon sets as the retail price.
It's no guarantee that they will raise their prices up to the full MSRP and they may not raise them at all, but if Canon offers a $100 rebate, they can raise the price by $100 and still be more than $100 under the official retail price.
For comparison purposes, both Adorama and B&H are selling the 60D for $888, instead of the $999 Canon sets as the official price. In contrast, both are charging the full retail price for the T3i. ($899 with kit lens).
I'm not going to risk giving anyone bad advice, but just suggest this is something to think about. (Well, I might give potential T3i buyers this advice: I don't think you have much to lose by waiting to see what the rebates are, since I can't imagine Canon is going to raise their own MSRP when the rebates go into effect.)