Not in the way you might imagine... but something like that can happen... or not. The time will tell.
you have to sign in to Relic to play online , thats why you cant just connect immediatly , its all connected by a server , hence reward units and CoH:O heroes( Id be willing to play a game with anyone that has it , but I have EF mod atm)
Skins don't work because your opponent doesn't have the same data.