
Originally Posted by
Uzor
Considering all of the Asauchi submitted to him instantly (something that I'm guessing is unheard of), it is likely that his new sword will just tell him everything except for maybe one thing from the get-go due to the respect it has to him, or some stupid shit like that. Remember, earlier it was stated that a Zanpakuto can refuse to learn you new stuff or help you out if you're too weak - which is why Ichigo had to fight Zangetsu on multiple occasions to get his power-ups. Now that his sword instantaneously submitted to him, it probably already knows how powerful he is and will just give it to him.
Which is why I threw out the half-joke-half-theory that his new Bankai will probably be all Bankais... An Asauchi can turn in to everything, and all of the Asauchi's submitted to him. And early on in the manga it was stated that in some cases, more than one Shinigami can gain control of the same Asauchi, at which point they have to duel over who should control the Asauchi, with the loser getting executed (which is how Kenpachi came over his sword). It's basically what the Quincy's do, and he is half-quincy after all.