At least the switch won't be all that bad. We'll get to see Yammy in action, right?
What? Ulq revived? The guy disintegrated into ashes.
If it does switch, we may see if Rukia has a bankai or not...I doubt she has one but I maybe wrong...
"When I am dead and have passed onto the next world, I want you to lower me from these gallows and....KISS MY HAIRY BUTTOCKS!"- Chris Farley Almost Heroes
If Rukia had bankai, she would have used it against the Espada she almost died trying to defeat. Her only surprise attack was her 3rd "dance" or whatever.
~Heaven Help Us~, Orihime needed all the pieces of Tsubaki to revive him, so one piece of Ulq. will do nothing.
EDIT: Now that I look back, Hachigen revived Tsubaki, but he needed all the pieces.