I say shocking because, really, I didn't know John Stamos was still around.
Anywhosers, he will be playing a dentist and new love interest for Emma. I can't imagine Uncle Jesse wooing the shy, OCD guidance counselor. All I can see is him with his comb, slicking back his hair and checking himself out in the mirror. Then again, Uncle Jesse was a rock star, so maybe Stamos will bring his guitar-wielding skills to this show.
I foresee an Uncle Jesse-Will Shuester showdown, presided over by--who else?--Sue Sylvester.
All in all, not a bad casting choice.
(Pictured: John Stamos, the way we all remembered him. Whose hair would Sue Sylvester make fun of more--his or Will Shuester's? Discuss.)