While not on the radar for release in the near future, the Trion team is working on PvP dimensions for Rift. According to a short post on the Rift Junkies forums, the new PvP dimensions are in a very basic state of development and players are given a slight bit of information as to how, at least at this point, they will work.
I'm the one that has been working on PvP Dimensions when time allows (which has been rare!)...
There's still no official release date set - it largely depends on how many features we want to launch with, and how often other tasks take priority.
I've got a very basic version fully functional now. Current working example: Click a banner to join a team, get teleported to your team's start point, fight, get a point (or points) each time you kill someone on a different team, when you die and hit respawn, get teleported to your team's graveyard and resurrect, and then at the end, declare victory for the winning team (or a tie!)... All of this within a dimension of your own creation, of course.
I'll be talking with Daglar some time soon regarding when & how we want to release this.
What do you think of the idea of PvP dimensions? Let us know in the comments.