It was stated in the press release detailing the Garrisons that Draenor is a "savage" place, and that in order to survive, players could either become savages themselves, or work with their factions in order to avoid doing so.
I just wonder what exactly will happen if you do choose to become a savage yourself. Maybe the plot will be different, and you will recruit different NPCs for your Garrison?
Or maybe this is just a scrapped idea by now and you will never be on any side but your faction's...