I think what's more interesting is the mismatch of image, not the racial angle but the sophistication/immaturity.
WB has had some toads on the log but generally, their shows seems to exude a sophistication vibe more or less whereas UPN is more sex, violence and playing on the baser instincts, which is fine to a degree. Either way, it's quite the clash and expect a lot of odd promos and new shows that won't match at all either.
Oops. Heh.