While I'm not going to give out many exact #'s (since it depends on numerous factors and other various issues) I will say Oog-ra and Thugians will have armor available to them that's heavier duty and larger than other folks can make use of. (And thus, provide greater protection) To give you an idea of the minimum range, the absolute worst armor in the game (stuff made out of like cloth, straw, silk, etc.) that currently stops 1 pt. of damage right now will stop about 25% following the update. So you need not worry about your 13 point armor stopping 26% =)

I'll also add that berzerk isn't too far off from being fixed here, and in doing so many of the issues that make Barbarians have some problems will be addressed. (Like the DR drop while zerking never getting better with level.)

Finally, greater moaning spirits actually haven't been changed over to the new monster standards yet. We haven't made it quite that far! (though we're close!)

Best,
Colin