One of the RvR MMOs that has caught our eye along with Camelot Unchained is the recently announced Crowfall - a buy-2-play PvP/RvR based sandbox MMO themed as "Game of Thrones meets EVE Online".
The game features a permanent housing world along with seasonal campaigns of varying rulesets eg. traditional 3 faction like DAOC, player factions, hardcore FFA. Participating in these campaigns will award guilds and players with resources to use in the persistent world wher they can build, expand and manage their own kingdoms. The game also has voxel based destructible environment eg. charge through a wall to break it down.
You can find more descriptions of the game's concept, features and direction here: