I'd just downloaded Arena Wars and the author has done a terrific job -- it has a really nice map editor, too. I'm looking at the terrain system, and it's not a straight height map with a 2048x2048 texture drape on top of it. There's some tiling, layering going on there. There's definitely a height map associated with it, but the texturing is much richer than a simple texture.
Does anyone know what this terrain system is called I'd like to study more about it.
Thanks in advanced.

Tiling Terrain System
jhudson
I hope this helps.
Take care.
Ciprian Gerea MSFT