Do you guys think after tweaks of Hexblade / Pact of the Blade, we still have a chance for a Raven Queen Patron?
Well Hexblade won't be in the game. They modified Pact of the Blade to work without it. As for the Raven Queen, probably not at launch. I don't think the announced classes and subclasses are it for launch. As for whether they add more later, hard to say...they probably will add a few more bits and pieces post launch but we don't know for sure.
