I asked Austin Peckenpaugh (Senior Designer) about Rage and Focus builds and how they're fitting into PvP overall right now, and here was his comment:
Rage and Focus have always been high burst specs, but they haven't been very popular due to some usability and quality of life issues in the past. Our goal for Focus and Rage was to address those issues without significantly affecting their burst. In large part, I think we've done that, but the result is that many people are playing them now, which means there's a lot of AOE burst happening in warzones that wasn't happening before. We're willing to wait and see if their popularity is a result of being viewed as "flavor of the month" (i.e. Rage/Focus populations will naturally subside as people realize the spec doesn't suit their playstyle) or if they are truly too good and were just too unusable before. In short, we're going to keep a close eye on it.
In short: You still have no idea what you're doing on the PVP end of the spectrum. Assassin/Shadow Tank hybrids are outDPS'ing PURE dps classes (This is possible in Tank stance mind you), Sentinel/Marauder burst death squads are obliterating everything within 6 gcds (Yet still retain the most defensive CDs and TEAM BUFFS) and Paired smash (geared) warriors are AOE bombarding the **** out of clusters of players. Sorcs still don't have a defensive CD, mercs are still a red headed step child in the DPS department (just like lightning sorcs, the lack of mobility // reliance on one spell makes them a joke) and Operative healers are still the best PVP healer in the game.
The only thing I've seen *fixed* recently was the Pyro/vanguard ability to destroy someone at range and melee.
SIDENOTE: I am happy to see another "we're keeping an eye on it" response which is along the same lines of "Soon" and "stunlocking operative teams ruining PVP". /sarcasm.
On a more serious note: Can any of the developers respond to the Class Feedback threads? Because as of right now, they haven't listened to a damn word in them and have mentioned NOTHING about balancing PVE or PVP.