If you missed the Tour video.

[mbncd]

I'm wondering how they'll manage travel restrictions..? Lots of invisible walls? Or a certain height we can't fly above that's bordered by mountains and the like? Maybe areas that are no fly zones altogether (due to security regulations or something, maybe..?)..? Maybe even a gauntlet of high level enemies that can one shot us no matter what our iLevel and that get denser the further we go, making it impossible to get past a certain point... We're only able to access a single continent so they can't have us flying too far out to sea or anything like that. A 2m deep river isn't going to be enough to block areas off anymore.

[Limecat]

I'm wondering how they'll manage travel restrictions..?

If they want to be fancy and lore-ish, they could have invisible walls, but before you reach them you run into a swarm of angry dragons that'll 1-shot you out of the sky.