Why release a trailer?
I think backers forced them to. We did. So many months in darkness, etc. caused people to light them up over paltry updates, skippage of large events(E3), etc. I think that pressure culminated in a need to show something, however unready it may be to show the project is progressing and money didnt dissipate to nothingness(like several Kickstarters)
I think they felt obligated to show something based on that. Damned either way.
I'm sorry--I think the game looks fine in recent screens, more is needed but it's 12-16 months AWAY from release..a lot can change.
Mass Effect: Andromeda made a lot of strides in the patches they did. Apples to oranges, but goes to show you much can change in a few months time.