It's hard to say. I feel like he'll end up fighting against some more Ao type members of Kara (the runners it seems), then end up spying on(joining) Kara after training with Sasuke to at least half control/use his seal.. Which is possibly the end of part 1? In part 2 obviously Kawaki becomes is his Sasuke and he ends up coming back to the village which is destroyed. The leader of Kara is who I assume to be his Obito, whom he'll fight after defeating or winning over Kawaki...and the Otsutsuki we haven't seen yet will be his Madara/Kaguya.