I always thought that it was devs testing with other devs. I wouldn't imagine anyone would be able to play against Jason just yet even if they're devs because they haven't downloaded him yet - like when you don't have the map pack in call of duty and it kicks you out of the lobby, you can see the map or in this case Jason but you can't play against him. Imagine going to work and getting told "Alright Johnson, we need you go online with this unreleased DLC and rek sum nubz all day. I want the report on my desk by 5pm today!!" - Oh, my head :')