I don't think anyone knows when or if there will be a T3i, but if you want a camera that's a step above the T2i, consider the Canon 60D. Same great video sensor and capabilities, plus an articulating LCD screen and manual audio gain controls, for very little extra cash.
I own a T2i, but would buy the 60D over it in a heartbeat given the choice.
Interesting... looks as if it has a ton of consumer-ish features added but no real improvements other than the articulating LCD screen, manual audio gain (which can be done on T2i anyway with firmware), and the 10x digital "zoom" which may or may not be as awesome as it sounds.
Seems that Canon keeps remaking the same basic camera again and again. T2i, 60D, 7D, T3i... they're all much too similar with the same sensor, video capabilities, and resulting quality for us video folks. There's zero innovation there.