The official FAQ for Pantheon: Rise of the Fallen has been updated, according to the team's Facebook page. Calling it an "ever-evolving" document, developers aim to make it as accurate as possible while also reserving the right to alter answers at any given time depending on changes made to the game as it progresses through development.
Readers can find detailed answers on a variety of subjects including "what Pantheon will feature that is new and different", "will you be able to solo in Pantheon", "will there be different ruleset servers" or "on which platforms will I be able to play Pantheon". These are just a representative few of the larger, very extensive document.
You can check out the full FAQ on the Pantheon: Rise of the Fallen site.