I'd love a hall of heroes thats easier to pick up groups than the current version in GW1. A random team version for all PVP formats would be so good, but I'm guessing that WvWvW is going to appeal to me the most as I mainly PVE and play PVP casually now.
I played HA exclusively for a year or two up to rank 7 hero title, then gave up trying to get a Tiger emote because the title curve was too steep (I basically needed around double the points for Rank 7 to get to rank 9, and I just thought 'Hell no, I'm not doing that much grind').
If ever a game can prove that people have no life outside of playing 24/7, its GW1 and anyone with rank 12-15 hero title lol.