Firstly i want introduce you new wild hero Golfimbul. His history allegiance and death from frodo ancestor you can find here Lotr.wikia.com
He will have 3 abilities
1st Leadership - Standart thing
2nd Arrow Valley
3rd Battle Hardened
Here some shots about that hero
This is how he loocks without upgrades on level 1
Also Goblin army wont be without cool new staff
This is Assault Giant or Armoured Giant.
He will have (Maybe upgrades like Tiberium essence avatar).