Gameplay wass never canon in the EU or in Disney canon since people like to fuck around, but that didn't stop particular games from being canon as how things were portrayed. Disney outright says if something is non-canon, otherwise Battlefront, in terms of the gear and such and the equipment it shows is canon.
http://www.ign.com/articles/2015/04/29/star-wars-battlefront-canon-is-complicated
STAR WARS BATTLEFRONT / 29 APR 2015 STAR WARS: BATTLEFRONT CANON IS 'COMPLICATED' 5.2k Sullust, as defined by DICE, is a real piece of the universe.
BY MITCH DYER Earlier this year, when a book sleeve revealed that Star Wars: Battlefront would be considered canon, most of us assumed it would be the DICE-developed video game. Following Star Wars Celebration, it became clear that the novel, Star Wars: Battlefront - Twilight Company, set following A New Hope, would likely be the canonical entry for that particular brand. But this didn't answer the major question on most of our minds: Is the Star Wars: Battlefront video game canon, and will it be considered in the future of films, TV, and other games?
"It's complicated," Patrick Bach, GM of DICE, told IGN.
Reveal Trailer 02:12 “ I don’t think that makes it canon per se...
Bach explained, "Canon is connected often to story. Is every battle you play out canon, or is this specific item canon? I can’t give you a clear answer on canon." Because Star Wars: Battlefront does not have a campaign, its true storytelling opportunities are limited. It draws from the Original Trilogy alone, where A New Hope, The Empire Strikes Back, and Return of the Jedi have already told the true stories of the universe. Cooperative missions take place in "iconic moments" from those films, and could presumably have static, canonical end points -- destroying the shield generator on Hoth as the Imperials, disabling the Death Star's shield on Endor, etc.
Battlefront honors the canon of Star Wars, but the unpredictable nature of competitive multiplayer in an online sandbox means there's no way to make any match matter to the wider fiction. We never saw TIE Fighters taking down X-Wings in the Tatooine canyons, but DICE adheres explicitly to the Lucasfilm Archives' original props and the aesthetic of the Original Trilogy. Furthermore, the developer can't -- and often chooses not to -- deviate from expectation.
Star Wars Battlefront: Co-Op Without A Campaign? 03:49 "You need to draw the line somewhere," said Bach. "I think the good thing here is that we have the same attitude as Lucasfilm. They want to keep it real, and we want to keep it real."
To that end, the relationship between DICE and Lucasfilm isn't superficial. "There’s a lot of IP questions," explained Bach. "What we’re doing, and the relationship we have with Lucas, is we get everything approved. They approve everything. So it’s not like a loose arrangement where, hey, you can slap the Star Wars logo on it. We work super tight with them. I don’t think that makes it canon per se, but that’s how the canon works."
Star Wars canon is the DNA of Battlefront, which isn't necessarily contributing to the overall narrative. Boba Fett can show up on Hoth and start wrecking Rebels. Maybe the Milennium Falcon engages in battle instead of taking off to Bespin. In the trailer, a flaming Star Destroyer sinks into the dunes of Tatooine. This doesn't mean it happened. It's just an entertaining possibility that fuses canonical puzzle pieces. It makes the post-Return of the Jedi Battle of Jakku interesting, as well -- wouldn't it be great to slaughter Rebels as Darth Vader, who would be dead by the time?
In the end, Star Wars: Battlefront probably shouldn't be considered canon -- except, it turns out, when it should.
Star Wars Battlefront: What's a Smoldering Star Destroyer Doing on Tatooine? - Star Wars Celebration 09:21 "We’re trying to stay within the realms of reason," Bach said. "You saw the Sullust scene in the trailer. That kind of doesn’t exist for Lucasfilm. But where we know that’s the planet where you build the evil gear. That’s where the Empire builds AT-ATs. That’s f***ing awesome. So, what does that look like?"
DICE pitched concepts of what Sullust would look like, and Lucasfilm agreed. "Yes, this is right, that’s wrong, more this, less that," Bach said. "Done."
Battlefront has defined the look of a central system in the Star Wars universe.
Sullust, as seen in Battlefront, is the Lucasfilm-approved version of the planet. Nothing appears in Star Wars anymore without substantial deliberation, and with no proper "Expanded Universe" in Lucasfilm's current lexicon, the Sullust created by DICE is Sullust. So, in a way, Star Wars: Battlefront is canon after all.