There's one thing that's been bugging me for a long time, and that's the design of the keeps. You have the tri-keeps that are all designed the same way; the keeps around imperial city and the side keeps all designed the same way. How about re-designing every single one of them so they're unique to give pvp players new experiences? We're now 6 years into the game and some design changes are sorely needed.
Also, it would be awesome if you brought back the ability to destroy the towers at resources. Having people kite around like addicts trying to find their fix and not being able to do any actual fighting ruins the pvp experience. The ability to destroy the towers would effectively solve that issue and the pvp part of the game would start to live up to its function which is Player vs Player, not Player vs nausea from running around and around and around etc.