The Exiled team has released information about the packages that will be made available for players. Anyone can play for a week for free. Beyond that, packages can be purchased for $19.99, or $39.99 that offer a several in-game perks including cosmetic items, character slots, avatar pictures and titles. The team also reassures players that in-game power will never be sold, ever.
You can learn more on The Exiled Steam page.