Sources outside the show, and backed up by anonymous sources from within 30 Rock, have informed me that Michaela Watkins and Casey Wilson have been let go from Saturday Night Live and won't be returning this season (although they may have participated in some pre-taped ad parodies and digital shorts). They're no longer listed in specific office protocol. Michaela just confirmed this to me herself. So it looks as though Lorne Michaels hired Jenny Slate and Nasim Pedrad not as additional females to the cast (as SNL follower Rachel Sklar over at Mediaite would have hoped), but rather to replace Watkins and Wilson.
(Mods, Im re-sumbitting this as i put the wrong picture last time as i am an idiot).
Im glad Caseys gone but im really going to miss the Bitch Plzzz blogger