It is sad that ANet did a complete 180 degree turn from GW1 when it comes to PvP. That being said, I think that you will find that GW2 isn't ever going to have GvG. First, the PvP population up and left a long time ago. Second, this game doesn't have the kind of combat that will lend itself well to a game style like GvG. I mean, the game would be over in like 2 minutes with the lack of healing/prots to actually slow down combat to the point where tactics and strategy can actually have an effect on the game.
As much as I miss GvG and HA, and I think that ANet should be ashamed that they gave up on the best RPG style PvP ever, the game is too broken to support GvG at this point. I doubt it will ever get fixed.
The worst part is that GW1 is still such a broken mess from Nightfall and lack of balance that it isn't even possible to go back and enjoy the original. I am waiting for the day that someone finds a way to talk ANet into letting us have Factions or Prophecies only PvP. That would be simply amazing.