Ward has no need to rematch Froch or Kessler, he beat both convincingly. The only reason he might is if one beats the other in a dominant fashion ... but even then he'd only give them a fight because people would go on about it if he didn't, rather than because he needs to. Beat Pavlik, fight the winner of F-K to shut people up, and then move up. At that point, he'll've done all there is to be done at 168.
His only shot at a potential big payday is Chavez JR and Martinez. Absolutely nothing in terms of money at 175...Hell, he'd be the draw. I'd just cut down to 168 as long as I can and wait on JR to establish himself(maybe fight Froch?) or go down and fight Martinez. The only thing waiting for him 175 is another division title.