The last (edit - and first) dev post I've read concerning anything about PvP was the announcement of new rules in 2.5 (Slaughter).

Quote Originally Posted by Grekumah View Post
As discussed in the Letter from the Producer LIVE, we will be releasing a new mode for Frontline that introduces new rules and features in Patch 2.5, as well as a daily roulette.

With Patch 2.5 right around the corner (Less than a week! Hype!), we don’t want to give too much away, just know that PvP is still very much on the dev. team’s radar.
That was Jan 15th