Hello,
I been exploring the old world with the chain Eagle Eye Macro, and physically exploring closed off zones for months now. Needless to say, I have realized that when flying in Classic is allowed, you will do a lot of interesting flights.
For example, from Ashenvale Forest flying to Hyjal. There is a mile tall cliff that you will have to fly straight up to get to Hyjal.
Another Example is IF Mountain. This mountain flying from Wetlands to Dun Morogh, while not near as tall as Hyjals flight up, is still a extremely tall mountain.
Teldrassil, while apparently getting a overhaul to make it look like a actually tree, is also another feat of ZOMG, that is big.
While Cataclysm is still far away and everything is subject to change, those mountains make Stormpeaks look like a mild slope.
There is also A LOT of flat areas of the map that could be turned into mini zones or god forbid... miles of Mountain Ranges. The biggest of which I've seen was southern Kalimdor, which Blizzard has said they have plans for.
But what about other areas, like the mountains east of Strangle Thorn Vale (Which has a pretty Waterfall that has no river at the bottom and a cave). Or west of Tirisfal Glades (which actually shows on the map). Would those simply be turned into.... mountain ranges.