It's a different level of camera, feature wise and ergonomically. IQ you'll get the same thing.
I find it hard to believe that the T3i would be the first crop camera from Canon to improve upon the 18mp sensor they are currently using. Probably will debut in the new 7D next summer.
The XXXD models have also had 18 month cycles in the past, so it could happen again. We've seen the XXD all over the place (12, 18, and 24 months...)
If I were you and I were debating between the 60D and the "next XXXD", I'd just go for the 60D and be happy with the extra features you know you'll have.
I'm very tempted to buy the 60D now given the big rebates which will expire in January.
However, I was looking at the release timeline for Canon (bottom of the page at http://en.wikipedia.org/wiki/Canon_EOS_60D) and realized that the T3i should be out in about 2-3 months.
It's reasonable to assume that it will come with a new, better sensor compared to that of the 60D. And who knows what else will be improved, at least in comparison to the T2i.
At the same time, it would surprise me if Canon shoots itself in the foot by releasing a lower-end camera so soon that bests the 60D in one or more key areas.
So... What do you guys think? Should I wait for the T3i?