I honestly think they daren't do much of anything, following on their absolute cockup of promoting BF5 and where that got them, I think they are scared to release any details/footage/dates due to doing the wrong thing and going down the same road as BF5 marketing did. I mean the saying "if you don't like it don't buy it" is still in peoples minds and the world is waiting for another BF mistake, they know it'll be the final nail for them.
After the last round, I think I would play it like they have this time round, the less details people have the happier their minds are with nothing negative to dwell on. Every-one has gone crazy over the one thing they've done wrong already and that's move it 3 weeks. All they need to do at this point is win some hearts and minds, a nice gameplay trailer this week, and a solid beta, then silence till launch - keep it simple.