Garrisons + naval missions evolving into full fledged naval bases (but done well) in the next expansion as we go to the SOUTH SEAS and KUL TIRAS to FIGHT AZSHARA AND THE LEGION AND N'ZOTH ALL AT THE SAME TIME.
#believe
This is what I want to believe, well minus all those bad guys in one place lol. Honestly I wouldn't be the bit surprised if the shipyard was just a testing ground for naval stuff in a south seas xpac. I got my ship yard teleport item today and if you read mail Khadgar sends you with it he's like "I think you'll be a great naval leader dude in the future." O rly?
As for a garrison evolution what I would like to see is them make a garrison that isn't ingrained into the core of the game. The real problem with garrisons is how everything revolves around them: Professions, gear progression, the 6.0 apexis dailies, the legendary ring 6.2 stuff. If you want to interact with nearly any system in the game right now you have to go through garrisons somehow. It just shouldn't be that way.
That's not to say they should strip out rewards from garrisons though, it should just be an optional thing. Minus cosmetic stuff anything you can get from the garrison should be obtainable other ways as well. Taking options away from people is exactly how we ended up with launch WoD.