As far as the retractable roof, I think that b1e3 meant a retractable hard top, like the Lexus SC-430, and Benz SLK.
There have been some spy photos of what looks to be an E90 with a retractable hard top. It's possible, as there are some slated new HT entries from Volkswagen, Volvo, Pontiac and Chrysler, and the new Lexus IS HT is due sometime early next year.
Dawn