I saw their presentation at PAX, and they did mention the tactical battles just a touch.
Here was what was mentioned:
-Tactical (X-com-like) grid field.
-Bonuses based on terrain type (hills increasing ranged effectiveness and melee defense, for instance), "High-ground" was specifically mentioned.
-Deformable terrain, though the degree to which it is deformable was pointedly not mentioned
We were also shown some of the troop design.
-There will be a "Quality" slider. Better troops will take longer to build, but be more effective than basic.
-You will get to "equip" troops as you see fit with certain armors being better than others, and likewise with weapons.
-There was some mention of strategic resources "allowing" weapon/armor upgrades, though the only specific thing mentioned there was that "having more iron means you can build iron things faster".
Sorry I heard nothing on damage types, but at the very least, I expect (speculate) Melee, Ranged, and Magic.