Lily and Gabby likely won't be back for S4, both are cast in new TV Series and are likely to be picked up for a Season. Taissa might not either, I think her new movie will be filming around the same time S4 starts.
Only really seething about Lily really. Although from what it looks like, Chloe Sevigny, Dylan Mcdermott, James Cromwell and Zachary Quinto don't have much going on over the next year. Hopefully at least a few of them return.
forever bitter about this.