My feedback is take this war around the world. Have us go to the Hinterlands and help the Revantusk (Horde forest trolls) and the Alliance aid the Wildhammer Dwarves. Have us go to Northrend and have us help there for, I dunno Horde Taunkas and Alliance Tuskar? Have us go to Pandaria and get Hozen and Jinyu. Have Jaina try to rebuild Theremore or something with the Alliance so they have a foothold on Kalimdor again, but give us Ogres and Alliance get something, I dunno, skinny human “Theramore Survivors”. Outland had races too like Sporelings and Arakoa. WoD had the Saberon and Botani. There are races all around Azeroth, many of which are already in our factions, but not playable, and many which could easily be in a faction, but are not.
I would add that my feedback for the devs is to focus on the races people already know and love instead of inventing new races from scratch and suddenly tossing them into our factions, please.
There are also other ways to do things, like this: