Dunno, after the unspectacular resurrection of Orochimaru, who was "sealed for all eternity", everything is possible imho.To be honest, I have had it with characters combing back from the dead. With Orochimaru he had a loophole, with those of Akatsuki and the rest too, but what kind of explanation is he going to use for Jiraiya? His body was never recovered so it's not like he can say his body was put somewhere.
It would be better if Jiraiya is never going to come back - it would be an insult to his tragic ending