More info @ BIMMERPOST's thread on this:
==> http://f10.5post.com/forums/showthread.php?t=640126
Info and official pics have been released.
EU will get xDrive M550d, UK RWD M550d (!). Official 0-100kms time 4.7s.
Price bump in UK 4800 pounds over 550i (based on X6 pricing).
X6 M50d 0-100 kms time 5.3s.
All good news except steep pricing.
(C) Autocar