We've been looking into the statistics of our users, and the results are over at http://www.extravision.com/blog/flash-everywhere - though other might be interested in what a SME in the UK sees as Adobe don't have recent stats available.
I expected more v11 players, and we certainly don't see enough >10.2 to mean we can to to Flex 4.5/4.6 which is a bit annoying. Tom