ukitake-taichou and kyouraku-taichou 

let's recap abit... so far we have seen bankai from these captains...
- kuchiki (flower flower thingy)
- komamura (big robot like giant)
- hitsugaya (ice dragon)
- kurotsuchi (fat caterpillar baby)

and ex-captain the blind justice guy

plus Abarai Renji and Madarame Ikkaku