Temples, Castles, Fortresses, Caves, Sewers, Cities...
There's a lot of indoors (or semi-indoors) places that WM/H could take us. Rural fields and towns are great, but there's a big field in terrain that other games are already seizing up. Wyrd, for example, has and official papercraft-esque terrain line with sewers and streets for their game:
Accessories like gaming mats may also help bring live into the game, maybe official "King Leto's Castle Mat", Khador Frozen Village Mat", "Menoth Temple Mat", "Everblight Taint Mat" could be developed (http://www.zuzzy.com/wc-bb-001-terra...aming-mat.html)
Interactive terrain could be also developed, like Mage Knight 2 terrain that provided specific cover and concealment, provided alternative weapons and other effects.
Finally, rules. The current indoors and structure damage rules are the same MKI had. These would need to be revised as walls and object play a larger role in indoors settings.
Just another development route proposal...