There are several MiG-31BMs in line service - there are pictures of them in this very thread, and on airliners.net. Do you know how to tell them apart? It's subtle, but fairly easy once you know what to look for - the antenna 'bump' on top of the cockpit is the easiest way.
Yeah i've counted well under ten so far, and there is no indication even that many have been upgraded yet. I was hoping there were some news regarding the speeding up of the process- especially after that declaration last year that the program was completed (I assumed that referred to state trials).