No the Opel Blitz is already in the game as a universal transport vehicle. There is literal dozens of soft-skinned Wehrmacht vehicles which have never seen the light of day in games,
http://www.kfzderwehrmacht.de/Homepage_english/Motor_Vehicles/Cars-_Lorries_-_Buses/Lorries/lorries.html
The Soviet faction still hasn’t received the T-44 tank, yet the forums are already suggesting adding new vehicles to the German side.