The new campaign will be a standalone expansion, called Ardennes Assault  that is based on Battle of the Bulge.

You will get an overview map where you choose where to fight, then preserve units that retain their veterancy from one mission to another.

More info here: http://www.coh2.org/news/22744/ardennes-as...ampaign-details

They did not provide much information though but it seemed like it is quite replayable.

Alternatively, can wait for Act of Aggression, Etherium, Ancient Space and Grey Goo. I think the RTS as a genre is having a rebound now after it being dead for years.