Honestly, I would like it to be open sort of ending. It should answer most questions, yet leave us wondering. Kind of how they wanted to end the series in the first place, with the whole driving down a road with the Operator at every light (I believe I quoted that from the commentary? Perhaps the Q&A on Troy's channel?)
I wish for Jessica to turn though, because I liked her. She added a new element to the whole situation, but at this point I would accept that she may be dead?
I hope Alex is apart of the ending and not dead at the moment. It should end with how it started, with the rest of the original cast, which is probably Jay, Alex, Tim, and maybe Brian?