I stand corrected, at least as far as the E93 is concerned! Maybe it is only the E92's that lack rear seat cup holders and the OP does have an E92...
Current: 2011 Space Grey E90 M3, DCT, Comp. Pkg., Conv. Pkg., everything but Cold Weather Pkg!
Gone: 2008 550, Space Grey, Sports Package, Sport Auto Transmission.
Sold: 2004 545i (U.S.), Steptronic, Silver Gray.