This is a winnable fight for GSP, perhaps one of the only MW top 10 that GSP will match up well against. He will need a varied attacked, using crisp striking to setup his takedowns. Yes, Bisping has excellent cardio and strong TDD, but GSP has mastered the art of the takedown.
My question will be what GSP has left in the tank at this point in his career, let's be frank here, the man has been out of the ring for nearly 4 years. But if GSP is still the elite fighter that he was when he left, expect him to utilize a combination of jabs, kicks and counters to keep Bisping from initiating the clinch. While Bisping has done a remarkable job against guys like Chael (IMHO, Mike won that fight), Sonnen's strikes were never that great at setting up his takedowns, he was great at dragging you to the mat and then moving to position. But Georges initiated TD's with such explosion, it was (is?) effective against even the most elite wrestlers. I will be shocked if Mike doesn't spend significant time on his back in this fight, it will be how he deals with the ground attack that will determine his success.
Where Mike is going to be faced with a challenge will likely be how his own striking game is nullified by defending against the TD, this is where Bisping's cardio could be a huge asset in this fight. Remember how Nick Diaz had such problems opening up his boxing against GSP, early in their fight, but managed to find more of a rhythm later in the fight?
For me, I like both fighters and expect to see a really good, if not technical fight (which I am a fan of). I can see roads to victory for both of these guys. Let's be honest here both GSP and Bisping have question marks.
Georges has been inactive for a while, so no one really knows what he is going to bring into the ring. As for Bisping, well he looked VERY beatable against an aged, and shopworn Dan Henderson (another of my fav fighters). I scored the fight for Bisping, but I still think Dan beat the crap out of him in the process. Dan is obviously a very different fight than GSP, Mike is not going to score at will standing, boxing from the outside with Georges.