I would love to see an alpha dire wolf. The new direwolf rework is WAY more intimidating then the origional ware wolves (just cause they look terrifying).
But a great addition would be an alpha wolf, who howls to rally his pack or even calls in reinforcments from the shadows in nearby foliage!
Or now that dire wolves are the main staple of the beast faction, a battlehardened ware wolf of the old times could lead them. Making them superior in moral and stamina and health points compared to dire wolves, as well as being much smarter for their experience and half human mind.