at least according to Nikke
http://www.deadline.com/2011/10/cbs-demotes-how-to-be-a-gentleman-to-saturdays-replaces-it-with-rules-of-engagement/
I have now confirmed that production on Gentleman will indeed shut down after 9 produced episodes. The final episode will be filmed tonight. That is effectively a cancellation for the sitcom with the Saturday run qualifying as a burn-off, though CBS never officially cancels a series before the upfronts.