I really got my money on Sasuke fighting Kabuto or Tobi. If Sasuke was to find out that they disrespected two Uchihas graves, or that Tobi's a fake, he would go ballistic!!! He might just join Edo Madara, knowing Sasuke. Edo Madara is exactly the type of person Sasuke would turn to.
Powerful as hell - check
Uchiha - check
Have grudge against Konoha - Hell yeah
Have Eternal Mangekyo Sharingan - added Bonus
Sasuke is soooo messed up right now. He's not going to the good side no time soon. I think that for him to even consider fighting Edo Madara, it would have to be to help Itachi if Itachi was fighting him.