Last week, Activision debuted Call of Duty: Vanguard with a trailer that for the first time in the series’ history ran with the slate “Call of Duty presents.” No mention of Activision. Nor did the video feature the publisher’s logo. The only reference to Activision is made in tiny print in the legally required copyright part at the very end of the video. Could it be that that the company is trying to disassociate its…