http://dailycaller.com/2012/11/09/petraeus-other-woman-a-married-mother-of-two-under-fbi-investigation/
I'm much more inclined to think it was an earlier KGB inbed woman or guy who got to him back in the Army days, and was brought into play to dump him.
Broadwell, though, is already supposedly being investigated by the FBI for trying to use Petraeus' email system ~ which, of course, a KGB inbed probably would try to do.
Could be a particularly smarmy case, and if we can make a connection to Axelrod, this one could be a real laugh riot!