I tried out the Beta, It's amazing how much you guys have done, Any thing i see wrong is all polish, there is no real fundamental flaws, So i will just offer a few points of advice, with the reminder that i understand it's a work in progress,
I would strongly recommend getting a good selection of tall savanna grass doodads, and filling out most of the empty space with them, leaving the sand as paths directing players to points of interest, without closing them in,
If the modelers feel burnt out, try working with fel orcs for one of the clans, they have a huge model stock, and can easily be explained as just ritualistically staining their skin with blood, this is only if you are still having to use basic unit models for heroes,
Some more wild life would also be nice, I have seen a nice selection of animal models, this could also help get more crafting components to expand that feature,
Maybe give the banner carrier a normal unit inventory, so some early game hunting is more useful,
It would be really nice if some more details about the heroes and units of a faction were listed in their quest info,
And finally, Maybe have clans that aren't chosen build up over time, and follow a very simple defensive AI, to keep a small garrison, so if you play alone or without a full collection of friends, someone doesn't get a cheap win because they started next to an enemy without any defense,