I don't see Dortmund winning next season tbh. Favre barely got in and they'll need reinforcements over two transfer windows to match Bayerns might, even if the latter won't have Heynckes next season which will probably be Robben's and Ribery's last one. The season after is another matter though.
Boateng will stay imo, Lewandowski is a more problematic case but there are still good chances that he won't go. Bayern don't want to let him go and Real, which was the most likely destination, has another manager and will certainly face a transitional season after the last three and ageing stars.