Hello there.
First of all, this is currently (most likely) only available for Alliance, until Horde gets to start in SotA.
First, use the known bug to join Battlegrounds while you are on a transport. (Deeprun Tram, Boats, zeplins, etc. I used Deeprun Tram for this).
Queue up for SotA, and join battle when the Tram is moving (might not be required, but just on the safe side.) If sucessful, you should spawn about here;
(Thumbnaile'd so it dosn't stretch.)
Then, swim towards the castle (You should see it if you have the max video settings for.. seing far away. The name of it slipped my mind right now).
Should get to about here before a invicible wall stops you;
Now, my guess is that a Death knight + random with a Chopper / mammoth, can use the bike to get past the wall (Correct me if im wrong), and then be able to run up there, and perhaps even click the Orb to win the game.
Can't provide a vid right now, and don't have a bike or mammoth, so if anyone could test that part that would be awesome.
Sorry if it's a repost, did search for it and didn't find the same thread (Unless I fail at searching!).
Thanks, and Enjoy.