Freewill
One of the obvious themes in Westworld is freewill. The guests (or newcomers) are free in the park to explore their curiosities and act out their fantasies, safe in the knowledge that it's all just a game. Whereas the hosts are bound by their loops and narrative. The hosts are programed to not hurt a living thing and to step in if there is any guest on guest violence. During the first season we follow Dolores and Maeve's journey to enlightment, however we are left questioning whether they actually achieve freewill or whether this is an illusion. This comes with the revelation that Maeve's narrative had been changed to one called "escape". We see in the last episode that Maeve gets off the train to go back for her daughter, but is this her own choice?
Timelines
It has been confirmed that Ben Barnes is back playing Logan, so we know that there will be more flashbacks. I'm wondering if the show will be able to trick us by making us think the past is the present or vis versa. Obviously this would only work for scenes that only showed the hosts and no humans (other than Arnold.)
Playing God
There are numerous references to creating life and playing God. Even Felix is secretly practicing on an AI bird. Doroloes' father Peter Abernathy tells Ford in episode 1 that his itinerary is "To meet my maker". He wants to warn Doroles to make her aware of her repeating torture so she can escape.
When asked about her world Doroles replies "Some people choose to see the ugliness in this world... I choose to see the beauty." Her view of her world at the beginning is of a paradise, which we can compare to Christian teachings of Adam and Eve. Like Eve Doroles is tempted to go searching for the truth. Instead of an apple from the tree of knowledge Doroles goes in search for the maze. The maze is a symbol of enlightenment and knowledge. We even see the maze inked onto one of the hosts scalps showing the maze is in your mind.
In the last episode of season 1 Ford points out the shape of a brain in the Michelangelo painting of God and Adam.
"The message being that the divine gift does not come from a higher power but from our owns minds." he then asks Dorloes "Do you understand what you will need to become if you ever want to leave this place?"
In the story of Adam and Eve with knowledge and freewill comes sin; and they can no longer stay in paradise.