World domination, who doesn't want to pose as the founder of Konoha and the one who fought Hashirama?
But I forgot about that, that certainly contributes to him being Madara more , but possibly Voice Hax no Jutsu?
But yes until he takes off his mask/ we see what's in the coffin I'm not jumping on the Madara bandwagon just yet, also why does Kabuto refer to him as "Tobi" and not "Madara" despite the fact that he's being introduced to him as Madara? Either he's trying to annoy him, or something deeper.
Kishi knows all, so just sit and wait!
Also check this out on YT ; watch?v=NVR_ZCa3ikc, you will LOL.