There were rumors of unaccepted transfer offers being considered after the World Cup and a January move away from the club was being hinted at pretty heavily during yesterday's broadcast (although, that could have just been Cahill responding to questions about Henry leaving). He hasn't committed to playing here next season, but unlike Henry he will still be under contract.
I wouldn't mind keeping Cahill if he moved to striker. If Petke's strategy is going to be "CROSS EVERYTHING," then I'd love to keep one of the best finishers of crosses in the world. But if there is a coaching change, major player overhaul, change in strategy, or Cahill plans on staying in the midfield, then I would rather he goes.