Thanks for the A2A.
There will be a lot of flashbacks. We have 30 years of William’s evolution that can be covered. Such as various adventures with Lawrence. In S2, we see young-William+7 years, who is more cynical and cold, but he didn’t become MIB overnight.
Various other characters could get their own backstory episodes.
There is plenty of future potential. Dolores is headed to Arnold’s old house, and there will be some kind of conflict between her and Bernard. The host-Charlotte will try to take control of the Delos board of directors. There might be some intrigue with replacing politicians and business-people with host impostors.
In the post-credits scene of the S2 finale, WestWorld has obviously deteriorated severely. “The system is long gone”. The hosts have some reason to keep resurrecting William, for some kind of mission.