Does anyone have any information about the Season Finale?

Well then wait until May 13, 2010!

Kidding, I have some spoilers for ya:
***********WARNING, SPOILER ALERT***************
So, all I know is that Michael appears and there is a fight with Castiel and it ends badly for him. Before u go all ‘Deer caught in the headlights’ on me that does NOT mean automatic death for our Angel of Thursday. It could mean, he becomes a fallen angel, of he reverts back to being Jimmy. Or, another possibility, he get’s sent somewhere, and we won’t know where until season 6’s premier. And yes, there will be a MAJOR cliffhanger, I think. Hope that helped.

go on wikipedia