From: Berlin, Germany
Copy and paste from the changelog:
10. Rule Clarification (section 7.1.1.) - Dense terrain modifier is applied to ground element’s CV during combat (attacker and defender alike) in mountain, rough, swamp and heavy wood terrain as well as in cities with population greater than 14. Ground elements of class “infantry”, “mech infantry”, and “infantry weapons” have their CV doubled. Ground elements of class “SP Weapon”, “Armored Car”, “SP Artillery”, and “AFV” have their CV halved.
Question to morvael: This only influences the CV calculation of the battle, but not the CV displayed?