The Eastern Front is going to achieve what so many RTS players have been yearning for so many years: The integration of the Soviet Union into Company of Heroes.
First of all, do not worry. EF is not going to harm your normal CoH in any way, you can still play it normally. Also, it does not overwrite any of the existing factions. It will add the new factions, and you can still play with the old ones as well.
The goal is the integration of the Red Army and the Ostheer into CoH. Complete with new models, skins, sounds, buildings, tech trees and maps.