Maybe so. The DLC info tells us this:
Acclimatization: Over time, troops will learn how to survive in the desert or harsh winters, giving these veterans an edge on the battlefield.
Sounds good. Looking forward to finding out more tomorrow.
This is hopefully the implementation of snow/mud modifiers in the unit context that has been requested by many people, they have said that they wanted to implement this a long time:
http://forum.paradoxplaza.com/forum...nics-etc-in-hoi4.957265/page-31#post-22371258