Its obito.. i have no doubt left anymore lol.
At first i was like: naaah it could never be Obito it wouldnt make any sence.. we saw obito for like 2 epps lol.. But after i have read the new manga my opinion has changed. The tobi that we all know has only a sharingan on his left side (obito donated his right eye to kakashi) + we never really saw Obito die.. we saw him getting crushed by a boulder but still.. we never saw him actually die! kishi told us in a interview that something big was gonna happen with kakashi..
Sooooo what he was maybe trying to say is that there will be a face off between obito (tobi) and kakashi! O_O damn.. im so F*cking curious now.
Please tell me whats going on in your heads and please dont flame.

im just thinking out loud.