Caught in Tirol, Austria on 24_10_2010.
Per the homepage:
These are the best spy photos yet of the upcoming 6-series convertible! Save for a few pieces of not very disguising tape, the production 6-series cabrio comes into view. The cloth hardtop remains on this 650i convertible (but we've been told that a hardtop option will be available).
Here is the BMW announced production schedule for the F12 / F13 6-series coupe and convertible.
March 2011 - 650cv
July 2011 - 650cp
September 2011 - 640cp/cv
September 2011 - 650xi cp/cv
Follow full 6-series coverage here: http://www.bimmerpost.com/6-series/
Here is a recent photo which shows what the 6-series production will be: