Hi invalid_char. Basically KCritter outlined the reasons pretty well. But I would like to add that the recent trend for the DVC has been that each WDW location they build seems to sell out quicker than the one before. BWVs sold out quicker than Old Key West(of course, there were alot less units for sale, but still, sales were quite brisk), and the Wilderness Lodge Villas are on pace to sell out by the end of this year or possibly early next, nearly one full year after opening.
Also, I spoke to various sales people at DVC who each told me that demand is very high and that they're getting far more inquiries about BCVs than any other DVC resort in the past, and the place isn't even finished yet. It seems that many existing members are seriously considering buying add-on points as soon as sales open up. As KCritter mentioned before, the location is "primo"(less than 5 minute walk to Epcot, and 15 minute walk to MGM). and the pool is, well, beyond compare to any other on property.