There are 3 planeswalkers in Theros. One is Elspeth. One is unknown. And one will probably be Xenagos. Xenagos is obviously a new planeswalker and we know next to nothing about him. However he is a satyr and is probably evil. If you look at the Theros trailer, at the end, you see a mysterious picture of his face. During this Heliod, who narrates the trailer, tells us that there is a evil power who is trying to usurp him. I found a card on the internet for Xenagos and turned it into a True-or-False. I personally think that it would be an amazing card if printed.