So typically Westworld likes to do multiple timelines but this season so far there's believed to only be one, however, there could be multiple worlds! The new theory is were watching a simulated world of what Rahoboem thinks Delores and others are trying to do.
There's been a couple clues, such as the logo being a mirror of itself, the subtitle of this season on wiki at least is Westworld: The Mirror (season 1 was the maze; 2 is the door), and if you watch the clips of Charlotte Hale's recording to her son, you may notice the dialogue in both of them have slight differences. Possibly a continuity error, but this is Westworld after all, everything is done on purpose.
I'm very interested to see the big twist in the next 3-weeks, and maybe we will find out the fifth peral identity, and it looks like Delores and Caleb will be heading back to the park.
https://www.tvinsider.com/930249/wes...ory-explained/