60D and 7D IQ is very similar. Unfortunately, it's very similar to their 15MP predecessor sensor too. Few people I know have upgraded from their 50D to the 60D. DR improvements are in the range of fractions of EVs.
If Canon keeps using the same old sensor, again, IQ will not improve that much. Digic5 will of course bring some improvements, but I believe it will hardly be worth an upgrade, especially for 7D users.