Bleach: Heat the Soul 6 has the largest roster to date with over 72 characters. New characters include Risa and Kaname. Every year a Bleach: Heat the Soul game comes out and it boasts the biggest gathering of Bleach characters on the PSP until next year.
What else did Sony do?
Bleach: Heat the Soul 6 has a championship mode where you fight tournament style. Winners get soul parts which can be used to tailor a character in soul customization mode. Sounds similar to the system Bleach: Soul Carnival used. Otherwise the gameplay looks familiar from these videos sans the new characters and Orihime wearing her Arrancar outfit.