I thought they balanced the division well, in that they didn't focus too much on it. My biggest fear, was that the early episodes are going to be overloaded with emotional tesimonials and introspection on the meaing of race and culture in America. How tedious would that be?
Imagine, if you will, a Survivor where the initial teams are Firefighters, Cops and EMT's. Seems plausible. Given those backgrounds, it would be unavoidable to discuss life in public service as well as 9/11, but it would be a mistake to concentrate on those aspects, to the neglect of what make the show great. i.e: buff bods, bikinis, exotic locations and genuinely difficult challenges. I'm glad they don't appear to be making that same mistake with the racially grouped teams. All I want to see is crafty play and fun (for us) challenges.
That said, I liked the one Philipino Woman's insight that her "Asian" team was actually quite diverse given the various nationalities of their backgrounds.
Overall, the cast seems fairly engaging and attractive, so I'll continue to watch. At least out of the corner of my eye.