Its admittedly unlikely to happen (Im pretty sure hes going to take the money and run and go for a faded RJJ), but I reckon it would be a good fight. Youve got Calzaghe who is defintely loosing some of his physical attributes and Kessler who looks like he's really starting to come into his prime with a defeat to avenge. I honestly think that this would be much better fight than the obvious RJJ onme, and even better than a Pavlik fight (Calzaghe still to quick for him, countering all night long for a wide UD). In saying that though, definitely the least likely of the 3 to come off.
I wouldn't mind Kessler-JC II and III for that matter. It is really the best fight(s) anyone can hope to make at any weight. Calzaghe seems retired now though, and is right now on a tour beating those he could have faced earlier in his career. I don't blame Calzaghe for anything. He finally agreed to fight Kessler, and won fair and square, and deserves to close his career with adding to his legacy.
Keep Calslappy away it, he's boring as **** these days and there are genuinely exciting fights to be made involving Kessler, Pavlik, Abraham.