If there’s an overarching theme to the information that’s been posted thus far for Sacrament, it’s that the designers clearly want it to have some of everything. Open-world PvP? Sure, that’s in. Structured PvP? Yes, that too. Raid content? Yes. Solo content? Uh-huh. Ukulele-playing dogs that fight against resurrected dinosaur necromancers? There’s nothing confirming it yet, but let’s just assume the answer is “yes” for the purpose of the running joke here.
What exists for the game right now is chiefly a large number of concept documents and design discussions, with the promise of a Kickstarter happening at some point in the near future. If you’re in the mood to check out new conceptual MMOs to follow in the future, you may want to give it a look.