Is a return to Philadelphia a possibility? There's always a chance. But he recently talked about his departure from the the Flyers at the trade deadline, and if we read between the lines, it was time for him for a change of scenery. Thus, the odds for him to sign with the Flyers this summer seems a bit slim...
Sometimes, the best thing to do is to move on, and that's what he did. He's with a team that will have the chance to make deep playoffs runs in the years to come, which isn't the case for the Flyers. Even if he doesn't return with the Panthers next season, he will be able to choose where he goes, but it will probably not be with the Flyers...