As far as what there is to be excited about...
* Forest shape
I take this is like the Siren ability to automatically change forms between land/sea? Well, it's nice and all, but VERY, VERY annoying for modders because they can't use it in their mods. Not that I'm doing a forest-themed mod at the moment, nosiree, not at all. I wouldn't even think of requesting features spesifically for my mod, at all.
Any way, this could play out in so many ways. Basic troops that have higher defense in forests? Cavalry that has lower stats in forests? Units that are sacred, but only in forests? Any special ability is interesting if you have to take terrain into account... What about one-use, one-shot ranged weapons called "ambush"? So many ideas...