That would probably be his new bankai. We all have seen that some Bankai's of the other Shinigami did not resemble a sword. For example, Soi Fon's was a freakin' cannon. Also, I have read some fics that when a Quincy dies and is sent to the Soul Society, they become Shinigami, their Shikai is a blade but their bankai is a bow. Just a theory.
Nice work. I got ot admit that every time ichigo gets a new power he looks cool so i can't wait to see what he will look like when he starts using his quincy powers. Let alone when he uses all the pwoers he gained at once.
I hope that this isn't the case narratively. It'd be kinda dumb... (like that weird pre-awakened Fullbring) The bow and arrow would be redundant... we already have Getsuga Tensho and Ishida (whose been absent this whole time...). I'm thinking that the only thing that happens to Ichigo and Renji is that they unlock something beyond a bankai or they can activate something like "True Getsuga Tensho/Zabimaru" which is something like the Final Getsuga Tensho in magnitude without the one-time use limitation.
THEN, once Ichigo needs to fight Juhabach, he'll get some other Final form that uses the reishi sampling that he got from everyone that time when Rukia gave him his powers back. (Another variation of this would be that this is how everyone who got owned is saved... since their reishi lives in Ichigo...)
Shrugs. Bleach can go in w/e way it wants right now.