I believe kishi will use his legendary plot no jutsu to make both the uchiha and senju ancestors back alive.
They will tell us the dark secret of so6p, by this knowledge, the shinobi alliance will finally realize that sakura is the next so6p. She will be accompanied by ramen guy who will feed her.
It is also likely that the juubi immediately shatter into pieces when he sees the duo.
Tenten is also expected to join the team