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The studio must prove to the market and fans, that the magic is still there. In this, I agree with the OP. So far, Bio has kept things very close to their chests. However, you can push exploration and the visuals as the bees-knees only so far. Sooner or later, you must put meat on the bones.
EA/Bio has a marketing problem if we compare W3 against Andromeda. That is, we are comparing a full played game vs one trailer and limited information. A 2:40 min video cannot adequately convey a story, side quests, romance and story telling risks. Even five of those trailers will be insufficient. In this regard, their hands are tied. The studio, must execute an alternate marketing strategy, until a proper comparison can be made. What can that be if there is one?
In the mean time, I expect Bio to keep things hidden and market what can be shown or are willing to show. However, comments that Andromeda has Battlefront like visuals (from Shinobi) may not help, as I see little people running around. Would one consider Battlefront like camera combat as a Mass Effect game? EA Play will show either another game representation with a cinematic trailer or a live game demo or a recording of one. The former will reveal nothing about the game play while the latter may reveal to us if the visuals are Mass Effect like.
With ten+ months to go, my prediction is another cinematic trailer showing the ship's interior, a new alien, one or two companions from the MW Galaxy, the Mako, some combat pyrotechnics.