Supernatural Season 6 Spoilers: Castiel's Angel Problem

Supernatural Season 6 Spoilers: Castiel's Angel Problem

Castiel isn't in the first 2 episodes of the season, but when he returns, he comes back with a bang. Let Ausiello (and exec producer Sera Gamble) explain:

Question: Any news on what will happen to Castiel on Supernatural this season? —Minha
Ausiello:
This season’s first two episodes will be Cas-free, but the full-powered angel returns in spectacular fashion in week 3. “Let’s just say some angels show up that are not so happy,” teases exec producer Sera Gamble. “Cas and an angel go through a window at one point and the result is not pretty. It’s a pretty spectacular stunt.”