I heard that PvE was still hanging on though, so I quickly made a level 1 there just in time to see the final countdown tick down to zero. The server has clearly disconnected, but I was not kicked out of game. There were no NPCs and I couldn't use any abilities, of course, but I was still in the world.
So I decided to go to Hyjal for my last time on Nostalrius. Turns out you don't even need a mount to make the jump behind the pillar.
It's been more than an hour and the game still didn't disconnect me. Guess it won't change even if I disable my internet. And since I'm effectively not online it shouldn't throw me out due to being AFK either. I think I'm just going to minimize my settings and hide the window.
I am not letting go just yet, not until the game crashes or my power goes out.

http://i.imgur.com/dpHOZfn.jpg
Stay strong, friends.
Yours truly, Vedun.