Orc boar boyz should be in fact a really powerful cavalry cause, in the tabletop game, the boar hits just as hard as a bretonnian knight! And that's just the boar! But they should have low armor (to be a cavalry).

I agree with what have been already said, just wanna add:

What about squig herders? they could be almost like wardogs in Rome: Total war! High atack, low defense.

And squig hoppers remind me the gladiators in RTW, skirmish, fast (almost cavalry fast), high attack value!

Black orcs ARE one of the best hand to hand units in the old world, high defense, high atack, good morale, disciplined, etc.

Savage orc boyz must charge without orders (in the tabletop game they have frenzy!), very high defense, low armor.

Is it possible to put savage orc boar boyz?

And what about little snotlings? they could be like peasents!

And a giant is a MUST!!!!

Orcs and goblins have a huge variety of troops to chose from!!!

I have two doubts with the O&G army:

1.- The whole army will have the trait "can charge without orders"? to represent the animosity and waaagh!? And if not...

2.- Is there going to be something to represent the orc animosity and the waaagh! rule?