I would have kept Juan over Hinske, but I think Hinske will get dropped after this play-in game. They'll add probably two pitchers and drop two hitters. Overbay is at least a more capable defensive 1B than Hinske, in the horrible event that it came down to such a choice.
After this round, they'll add Maholm and one of Martinez/Delgado and drop Pastornicky. The other drop would depend on McCann's health. They'll drop either Boscan or Hinske and I'm hoping that Janish will be healthy enough to replace Baker.