I wouldn't take this seriously at all, the reps are the type of people that think the information will just come to them first. They aren't actively seeking it or hunting around for it, just waiting. I'm sure he'll find out when we do.
As for the T4i being the new camera, it seems kinda crazy to think that Canon would release a true consumer camera on the 25th anniversary of EOS. You would think they would want an epic product for an epic milestone. Plus, we've gotten the T2i, T3i, 7D, and 60D since the 5DII came out, we're due for a new 5D and everyone knows it, even Canon. And last, we have pictures of the damn thing in the wild. That being said, I can't imagine that we're far away, even if March 2nd did end up being the wrong date.