They could easily justify (since they LOVE to justify every bit of gameplay feature with some lore behind) new large scale pvp modes with a GC update. Would love to see new GC sets, but also an update to the old Elite ones, making them dyeable and with a high res texture like some of the old sets we got through pvp.

Honestly, one thing I'd like from old zones is just merging the capital cities' instances into one. They were divided before because of the PS3, but it's no longer an issue.