I can't speak for an 11, but when I ordered my 2010 35d, the initial build showed the ventilated seat plus multi contour. I ordered in early sept 09, which was only a few weeks after they began taking 2010 orders.
I raised this with the CA, and he said he would check into it. About a week later, the ordering system was corrected, showing that multi contour came with ventilated seats.
Of course, this may have change for the 2011, but for the 2010 it worked out.