Doesn't the 60D use the metering or some other system to help with autofocus? This may be the difference between the 60 and 50D. I have tried out the 60 at Best Buy and it seemed pretty nice. I was hoping for a "smaller" version of the 7D AF system. Does this "Frankenstein" have any parts that did not come from another EOS camera...aside from the articulating screen?
Metering determines how the image will be exposed - too long, too short, or whatever is considered "right." Autofocus may be helped out by the current metering system (introduced with the 7D, called iFCL, or a 63-zone "Focus, Color, Luminance" system, basically it's just a newer system) but autofocus has a specific subsystem. Does one system help the other? Dunno to be honest.
The 60D's autofocus is its own beast. It has fewer AF points than the 7D (9 cross-type compared to 19 if memory serves), but, like the 7D, the center one is "additionally sensitive at f/2.8 or faster," which wasn't the case with any previous non-professional (not the 7D, not the i.e. the 1D / 1Ds series), affordable camera. The autofocus points also may be a different size, which has its own repercussions. (Edited to clarify.)
The 60D isn't a 'frankencamera' at all; it just has a bunch of familiar-looking specs. The actual parts involved are far different than they might seem. (I remember smiling a few months ago at a DP Review article saying they would be surprised if such-and-such company designed a "totally new viewfinder unit" for a certain camera.)