Relic's never done that. They've always integrated. see: Dawn of War 1, OF.
edit: Ah I see. If you have ToV you can choose to replace existing units with the ToV units.
less than ideal but i'll be getting ToV anyway for the SP heh.
TH: While there are some adjustments to multiplayer balance based off community feedback, the biggest multiplayer addition are the game modes. Invasion is a cooperative mode where players defend a town against waves of attackers--a very fun comp-stomp mode. In Assault, players choose a hero unit and join a larger battle to push back the front lines of their enemy and destroy their base. And finally we have Panzerkrieg. Multiplayer tank destruction using direct fire is a recipe for mayhem.
this stuff sounds great though
Wonder if those gamemodes can be integrated into EiR at all, particularly Invasion.