In the just-arrived November issue of Roundel magazine there is a summary of BMW's new model releases.
They still say that the F10 5 series will debut at the March 2010 Geneva auto show. But now that we know official photos are due out soon (Nov 23), doesn't March seem like too long of a gap? Might the launch move up sooner now?
Anyway, an interesting additional comment is that
the M5 will follow the standard 5 series by about 6 months! 
Cool - I figured it would lag by one year.
Another highlight is that the new 6 series will be introduced in the second half of 2010 (as a 2011 model of course). That also is sooner than I would have guessed - again, I figured it would lag the standard F10 by one year.
And a final nugget: the CS Concept Coupe may not be completely dead. The talk now is that some version of the concept car may be built as part of the next-gen 6 series.