I honestly hope it's not a "Yellow Garrosh" situation so much as a legitimate change in pace for the Alliance—we need more long-term changes to the factions. With the new identity of the Horde as a loose federation, it would be an interesting change of pace to see the Alliance return to its darker, more fanatical portrayal in the original RTS games through Vanilla. I hope Turalyon is a legitimate leader who won't simply be overthrown or turn evil, but will instead remain in charge of the Alliance and allow it to finally play a new role in the dynamic that's been set up.
It would also resolve the whole muddling of faction identity to add a more fanatical, dictatorial Alliance so that the change in identity of factions becomes less an "Alliance and Red Alliance" situation, but instead becomes a Hegelian sort of realignment where the Alliance take on some elements of the Horde and vice-versa whilst keeping their underlying themes.