:wiggle:
Durr, did some searching and didn't find anything similar to this.
Found this method kinda useful when I've been flying over locations which remains to be discovered.
Anyways, here it is:
I was flying from Dalaran to Howling Fjord, and I were queued for some battlegrounds at the same time. While flying, the Enter Battleground thingie popped up and when I pressed it, it was like I were dismounted from my taxi for a sec. There's around 0.5 sec between the loadingscreen and your current position when you enter, so I weren't able to provide a screenshot. Got a glimpse of the new area message before I joined, and it were in my log when my loading was finished as well.
So to sum this up, by entering a battleground while taking a "Taxi", you can discover new areas that you haven't discovered already.
I'm sorry about the english, but I hope it's understandable and that you find this a tid bit usefull.
:wiggle: