Have India thought about having Dravid or Ganguly open (maybe even put Tendulkar back there)? Then Yuvraj could slot into the middle order and play his normal aggressive game without constraint.
As for Pietersen, well Collingwood is clearly ahead of him at the moment ad if Key keeps playing this well and impresses in the NatWest series, then those two are obvious candidates to replace Thorpe and Butcher. Where that leaves Pietersen, I don't know. Nice problem for England to have though (for once).