I don't know about you

I don't know about you, but to me Hyjal doesn't look bigger than the rest of the Kalimdor zones. Vashjir does, but that was a slightly different situation. Uldum I'll give you.

The rest really cheap Wow Gold eu do seem to have enough "stuff" to fill in. The quest hubs aren't all that far from each other, since you're supposed to walk to them, but you can put, say, a gigantic snow-capped mountain range that you can climb all over and explore in the middle of the zone that's fun to climb over from the ground and breathtaking from the air.

Actually, the other "big and empty" zone I think of offhand is Borean Tundra, which was designed with grounded questers in mind (if I've got that right).

I like flight, but I'll do the whole wait and see thing. I'm not the sort that pre-orders/beta tests/races for realm firsts anyway.