I'd personally like to see Ironjawz just stay the semi elite army they are.
Let the Grots have the horde title.
Be patient. Their update will come. Probably sooner than later. They are pretty much the destruction posterboys.
We'll get some new toys and tools.
Im predicting we'll see some warmachines, some kind of scout/ranger/ranged type unit, and some Gore grunta heros.
I firmly believe that if we got some upgrade sprues for brutes with some new weapon options that would go a lonnnng way.
Id love to see a Troggoth unit added to us as well as it seems Moonclan are getting one.
Then if a soup tome drops later on for a unified way to play all, thats cool too!
I know there's others that feel the same and GW continuously give hints that IJ are not typical "hulk smash" orruks and are actually pretty cunning, but I have always viewed them as heavily influenced by Urruk Hai from LotR.