My understanding was that BB was only going to carry the 600 series but it sounds like they have moved up the line. I have not seen higher end speakers driven by MACs around here, but I will keep looking.
Existing B&W dealers typically carry the whole line. And, as much as they would like to sell just high end speakers, they also sell a lot of low end and mid range ones, especially if they also sell home theater. If they have to compete with Best Buy on a significant part of the line, I would not be surprised to see a signficant number of dealers drop B&W and Classe and find another alternative.