You know, I'm not convinced Ichigo is still in his mortal body. The reiryoku transfer used the same method as the one Rukia used on Ichigo in the first chapter, except more refined and controled what with having a special sword specifically prepped by Urahara.
This transformation was very similar to the first one, and we didn't see Ichigo's body in the original Death and Strawberry either. I for one believe Ichigo stepped out of his body and that it's still there, only out of frame.
If he did lose his powers, that kinda suggests it was his own fault.