User blog comment:Apocaylpse06/Ichigo Kurosaki's (New) Zanpakuto/@comment-3393030-20110817034524

I believe that is Zangetsu, because if it was a different zanpakuto then it wouldn't be in its shikai state and would be sealed because ichigo wouldn't know the name of his new zanpakuto so it is highly unlikely that it is a different zanpakuto.