Ella Montgomery: Mama Montgomery appears to be alive and well for Episode 24.
Jenna? We know we find out a big secret about Jenna (Tammin Sursok) in the 3B finale which suggests she's alive, but maybe not.
Spencer's family? The synopsis for Episode 22 says Spencer (Troian Bellisario) is AWOL, and "even her family doesn't know where [she] has gone." That casual mention makes it sound like the whole family is intact, though that could be misleading.
Toby? Although we've speculated that the death could be Toby, everything the cast and crew have said about Toby's arc this season suggests there's still too much to be explored for him to die, at least right now. Plus, it sounds like he's in the finale.