The Frostwolves, one of the more peaceful clans of orcs, settled in Alterac Valley. Though in Classic they had problems with dwarves over who owns said valley, they did manage to make a pact to make the dwarves move out. So between the Frostwolves and the dwarves now there's no conflict anymore.
Furthermore, during the current events, Drek'thar denies the aid of his orcs to the orc commander in the region and to the Forsaken, thus denying aid to the Horde in destroying the Alliance. The Frostwolves don't really have any quarrel with alliance races anymore and don't want to lend aid in destroying them even when asked by someone of a higher rank in leadership.
To add to this, Thrall, or Go'el (I prefer Thrall) is now mostly neutral helping the Earthen Ring for quite a while. And he's a former Frostwolf, an important one too, being the child of the former leaders of the Frostwolves.
And last, not many Horde factions have ever gone neutral, willing to put past differences aside for peace, and the Frostwolves would be perfect for that.
So, what do you think, should the Frostwolves go neutral in the war?