Up until now, all Star Wars video games, comic books, novels and TV shows have not been considered canon. But a while back, Lucasfilm and Disney announced that they'd be creating the Expanded Universe to create one, new, everything-matters continuity.
Looks like that slipped under the net, a little... As the new #150th issue of Star Wars Insider mag is reporting that canon began in their last issue, with a short story titled "Blade Squadron."
Huh. Regardless, it's exciting to know that every issue of Insider will feature canon of the Star Wars galaxy!
"Blade Squadron" is a two-part short story written by David J. Williams and Mark S. Williams, inspired by artwork depicting an unused battle scene from Star Wars Episode VI: Return of the Jedi, and the story focuses on an elite squadron of B-wing starfighters on a suicide mission during the Battle of Endor.