The Goodhollow transformation, but it could also be some kind of hybrid we never heard about. Either way Aizen believes he just leveled the playing field.
With that Aizen nukes Ichigo, sending a blast so high into the air that it could probably be seen by shinigami satellites. This blast does nothing but gives Ichigo’s arm a little blackening, but he is still able to fight. Aizen quickly snatches Ichigo up and threatens him like usual. Though this time the threats do nothing for Ichigo because he is also very angry, and is nowhere near being beaten yet. Now Ichigo will show us all just how powerful his new Getsuga Tenshou really is.