I know that both blondes, Dianna Argon and Heather Morris, are no longer regulars.

Even these people, Amber Riley, Harry Shum Jr. and Mark Salling, are also no longer regulars.

Cory Montieth has been cremated.

Jayma Mays looks like she will depart after the end of Season 5, but since her character is married to Matthew Morrison's character, then that means Matthew might depart at the end of season 5 also.

Vanessa Langies is departing after the 100th graduation episode of this show.

Jenna Ushkowitz, Darren Criss, Kevin McHale and Chord Overstreet will no longer be regulars after the 100th graduation episode.

Lea Michele will finish appearing in this show up to the last episode of this show.

Christ Colfer, Naya Rivera Jane Lynch and Iqbad Theba will think it over.