I use a T3i for both wildlife stills and video.
If the T4i 9 point auto focus is anything close the 7D, the moire and aliasing in video gone like the 5d3 and it has resonable tracking focus with touch screen selectable points like many of the camcorders it will be an incredible upgrade in the sub $1000 price point.
With the 3x crop zoom in video mode, the T3i is one of the best wildlife cameras ever made. A 70-200mm becomes a 960mm. A 600mm becomes a 2880mm. There's never been anything like it. Anyone who says the IQ is not very good with the 3x zoom has never used it with a high end lens.
The only cam that even comes close is the panny GH2 and it falls down in so many other ways, particularly stills and highlight rendition, that it's not in the same league as an all arounder.
Really looking forward to seeing how this one comes out!
Cheers,
Pete
http://vimeo.com/user3461281
http://www.youtube.com/user/c3hammer