Hello,
I found a way to get Past the skybox in Kalimdor, no hacks/mods whatsoever.
You basicly can fly up as high as you want to, meaning that you should also be able to get past the map end markers. Opening up the old way to GM isle aswell? I haven't tried But I think it might be Doable.
Heres how I did it:
Get to this spot:
Look for this tree(Higher then the others around there):
Follow the branch:
Fly Up:
Go High:
Visit high places(Orgrimmar):
And Maybe Visit Unexplored Places
Thanks,
Ramon(o)