I picked up a Canon T2i on Friday and shot with it over the weekend. I used the Marvels Cine picture profile with sharpening turned down a click. Impressions: This is an amazing little camera for the price, if you need something very robust and durable fork out the cash for the 7D or the 5D, if you need a backup for your 7D though here it is, same sensor (almost) and same video quality. "Crash cam"? - Yes.
Live Focus - Not really, if its dark the iso boosts when you do a half shutter depress and it hunts in video mode.
Stock Lens - only worth it if you don't have one
HDMI Out - Not really. Until Magic Lantern or another computer guru does some more magic with firmware the hdmi out comes with all of the onscreen controls, the focus box, and still drops to sd when you hit record (the signal also drops out for a second then comes back at the beginning and end of recording)
Color Temperature - Limited control here, you either dial it into a picture profile, or use the in camera presets, or white cards.
Histogram - Kinda, shoot a clip, then review it with the display info on, it works but not pretty.
So here is a link to what I shot Sunday, slightly cc'd for color and contrast. I'm re-compressing this tonight but it is a good example of how this handles a wide exposure range (snow to subject) and the camera jello - this was shot all hand held with the stock lens.
http://vimeo.com/9847970