I saw someone else speculating that they'd be releasing a "rev b" MBP with optical thunderbolt ports. I hadn't heard that rumor anywhere before, though.
IMO, it's pretty unlikely. Based on some preliminary research (macrumors buyers guide page and Everymac.com) it looks like they usually go 8-14 months between revisions, but I think sometimes that have a tiny spec bump in less time that that. Still, 3-4 months would seem much quicker than usual.
I suspect both resources I consulted do not show the really minor incremental bumps. I remember I bought a TiBook once that had been out for only a couple months, but in late december, they started shipping it with a Superdrive (or combo drive...can't remember...it was one better than what preceded it). So stuff can happen.