On the one hand that seems a bit early, on the other this is Marvel’s big film that is meant to bring back people who have stopped watching the MCU. If the trailer does well, great, if not they have lots of time to adjust their marketing strategy.

We already know RDJ is playing Doom, so I expect the majority of the trailer will be focused on who Doom is and his goals (at least in part). It may even be in the hero style where Doom is our hero character.