There are conventions for everything these days, so what made you think that Star Wars would be any different? It's been confirmed that EA Games will be in attendance at Star Wars Celebration between 13th April and 16th April, where it will "showcase the latest" from its Star Wars projects. Seeing as Star Wars Battlefront 2 is locked in for a 2017 release, it'll almost certainly be on show.
Of course, it'll be interesting to see if the publisher has anything else ready for the event: we've barely seen anything of Visceral Games' action adventure title, and we know that Respawn is working on something Star Wars related under the stewardship of God of War III director Stig Asmussen. We'd just bank on Battlefront for the time being – especially with E3 2017 right around the corner.