I am not entirely sure how I feel about the new Waaagh rule. Yes it is simpler and can be used at the start of the battle round, not to mention, that you don't need a Warboss to use it.
But it only provides the bonus for 1 battle round and nothing more. When I compare this with other faction rules, who get a bonuses for the whole game, I am not sure it is such a good deal
Last but not least it pushes Orks entirely into melee, there is nothing to gain for shooty Ork armies.