I'm guessing it will drop a little more, but with the T4i sitting at $850 just for the body, I don't see them dropping the T3i that much. The T2i has been around how long? It's still only $100 less than the T3i is.
The T4i might go down a little once it gets out there. I'm not a marketing expert, but if I were Canon, I wouldn't want to drop the T3i too much and create an even larger gap between it and the T4i. The T4i has some nice improvements, but is it $250 (or possibly more if the T3i drops in price) worth of new stuff? I'd worry about the general perception of that if my goal is to try to sell more T4i cameras.
I imagine eventually the T4i will come down in price and the gap between it and the T3i will close up a bit, much like the T2i and T3i are now, but until then...not sure I'd count on any significant price drops in the T3i.
I'd start looking for retailers that offer some kind of sale or discount on the T3i. I just got my T3i two days ago from HHGregg. They advertised an 11% off sale for anything ordered online. I got my T3i with kits lens for $667. I ordered mine for in-store pick up (no shipping fees), said 3-5 days to ship it to store, but they emailed me the very next day that it was in (must have had them in-store and the web site inventory wasn't up to date). So, i ordered it on Monday night at 8:30PM and picked it up the next day for almost $100 off current price.