User blog comment:SilverRain/Ichigo's True Strength/@comment-10961564-20130630094632/@comment-11051098-20130630111307

Well, his new Zanpakutô is made from an actual Asauchi which he never had, so even though his true power is still Zangetsu, the physical blade is completely new. So he got a new Shikai, and I think it's clear as a crystal that he will get a new Bankai as well.

And as of yet, we don't even know what possible new attacks and techniques he could have gained from his new Shikai.

I also think that the power level he gained after the Dangai training might be the level he's at now that he has his full power. Seeing as how strong he became then, defeating the ridiculously strong Aizen with no effort at all, I think that's how strong he will be now. At least that's my guess, until we get to see his full power in battle.