I have some bratz collectors as friends on facebook and I saw a post a while back about them. I also saw a thing on youtube toyfair that showed the dolls. Sorry I don't have the link but I'm thinking if you search youtube for the dolls it might come up.
I think that they are also doing boys to, at least thats what I remember seeing in the youtube video. From the facebook discussions I remember someone said that they were only going to be sold by one store - but I have no clue if that is or isan't true because the person never listed the store they'd be in. I'd think if MGA were doing this much promotion on the doll it'd be at more stores than just one.
When they do come out in stores I hope I'm able to get a few, not only because it's a wonderful idea but also I'd love to buy extras just to use with wigs and redressing.