Hmmmmm, Naruto seems to be getting control over the situation with Jyubi x Madara x Obito, unless they start working separately.
The Hokages will probably not join the fight... although it would have been awesome if they came, with Sasuke going through each of the Kages (chronologically) and proclaiming that he has been chosen as the 6th Hokage by the previous Hokages (or at least as a candidate, so that Naruto and Sasuke could still have the fight for that title), seeing as if he learns all secrets and chose the path that they did, they might indeed chose him. This would make Madara's previous statements and all future statements about Senju controlling the Uchiha, invalid.
Just imagine, Hashirama taking on Madara; Oro with Sarutobi watching the whole fight (or taking the bijuu, since they have some experience); Minato quickly gathering (with his time-space ninjutsu) Zetsu clones, then joining Kakashi in owning Obito; Tobirama using Zetsus and his ET to revive all the ones that died in the war (including Neji) to kick ass once again.
Well anyway, I wonder how much time is left until Jyubi enters it's next stage and, going by the amount the tail it has (similar how Naruto was slowly, by tail count, transforming into Kyubi), if it will have 10 forms/stages.