eTO has a tradition of releasing all the past Halloween sets along with new Halloween sets every year.
So I'd expect to see: Corvid, Nyxx/Nurse Nyxx, Noxx/Ninja Noxx, etc + Something new.
On-topic: I don't think I've said this yet, but I really like the sprites for the new fall pet. They seem really smooth and ''clean''. That's a must-have for me.