This is my shortlist of things I want to see in 7.X for Large scale PVP
1.) A short but mandatory interactive series of trials to explain the general ebb and flow of large-scale engagements for new players.(yes I am once again asking for hall of novice pvp edition)
2.) Map rotation based on hour(s) rather than days would be nice.
3.) More direct interaction with balancing. Nobody enjoys months of awful meta play while waiting for the next big patch.
4.) New maps/modes to fill out the roster. New maps could even be different areas of the same places that have different layouts. I for one would love a redux of Ballista and it would be on theme with a somewhat XI flavored expansion.
5.) Please either add Rival Wings to the rotation for frontlines or better still give it its own roulette.
6.) More rewards to purchase with wolf marks/trophy crystals. There has been a good push on this lately but let's not go slack on the momentum. Some things could probably have purchase prices adjusted slightly to strike a better balance between casuals and no lifers.
I'm sure other people have opinions on this as well these are just the quick ones for me that deserve mentioning.