I guess, one of the "problems" of 7D regarding IQ are the wires. As it uses 8channel Readout, rather than 4channel, this might cause some more signal noise. I now have read several times, that 550D-Sensor is a little bit better in the higher ISO-modes than 7D, but overall they're not so much different.
If that's true, that t2i-sensor delivers a better iso-performance than 7d, I'd say this:
"As you'll see below, the engineers have managed to eke out just a bit more crispness and detail in the Canon 60D than in its already-excellent predecessor." is real promising.
Read the whole Review here: http://www.imaging-resource.com/PRODS/E60D/E60DA.HTM
This includes some hi-res pics in serveral iso-settings from the same location/perspective taken by 60D and rebel t2i - even available as raw.
My first thought was: Pretty nice. Starting at 1600 a slight but noticeable difference shows up.
Wished they had included some pics shot with 7d, too. :-(