Just got home from the local dealer.....the regional trainer was here today in a Phantom Blue (dang!...missed it) doing dealer training on the 5.
Anyway, they also finally got some brochures and an accessory brochure.
The accessory brochure shows a two cross-bar setup sort of like a Yakima or Thule rack. No lengthwise rails like on the European models. As I matter of fact, in one picture, it shows a bike rail on the roof rack....and it is a Yakima bike rail.
It also shows a ski/snowboard rack (branded Yakima)...only 1 board wide, maybe 3 pairs of skis if they are loaded bottom to bottom, not side by side, and a 13 cubic foot closed cargo box, 55" long by 35.2" wide by 18.2" high. If I look closely at the picture, it shows the cargo box is a Thule. There is also an open roof luggage "basket" with a cargo net, measuring 44" long by 39" wide by 6.2" deep. It says "Yakima" on it. So it appears regular Yakima/Thule type add-ons will fit this rack.
The rack looks to attach in the fittings under the rubber plugs on the black roof trim, where the European style rails would be mounted.
Weight wise, the brochure says 100# max.
If I had a scanner, I would scan stuff, but no scanner...sorry.