The upcoming Cas-focused of Supernatural will shed new light on the character.
Ben Edlund, the writer/director behind the episode, said the following:
“It’s kind of him looking over his life. And as we move toward the end of this season, Cas is going to make some very, very big, difficult choices. He takes stock of what his life is as an angel and what it’s been since the Winchesters came into it and what that’s meant to him. It’s a pretty interesting character portrait [and] it leads to a pretty interesting path. We’ll [also] see some elements of Heaven, a very kaleidoscopic place. We’ll reveal some things about the mechanics of Heaven.”