User blog comment:SoulReaperBleach1/Izuru Kira.../@comment-4822693-20130702232706

I'm pretty sure that he will come back, as a member of the quincy army though. I've been puzzling over what Yhwach said about reeducating Ichigo. I've come to the conclusion that Yhwach has some form of brain washing ability that he can use on a soul that grants it quincy powers, but as a "side effect" forces the soul to follow the intent of the master. It's why all those other quincies aren't true quincies. They are really souls artificially infused with Yhwach's power.

This leads me to two possible conclusions for what happened to Uryu. Either Uryu is also brain washed, or Uryu, being a descendent of Yhwach and therefore a true quincy, is the only person capable of using the same technique. Without this special power the quincy army would quickly disband.

I also think that the reason why we haven't heard anything about Kira, is because he was taken back by the stern ritters and reeducated. He was definately more injured than any one else who survived, since he had part of his body destroyed. This is the only reason I can think of that we haven't heard from him yet.