I propose a new pvp mode that shouldn't be too hard to implement: rated duels, 1v1 arenas. I think many players would love this feature, and given that you already have solo queue, this sort of thing seems possible, even easier than the solo queue format. Skirmishes or rated, just the ability to queue duels. Doesn't even necessarily have to be rated or give rewards, just a new avenue for solo players would be fun, and it's something Blizzard never implemented, like solo queue. Warmane could lead the way.