According to page 8 of the latest issue of Star Wars Insider (#150), every short story in the magazine beginning with the first part of "Blade Squadron" in issue #149 is part of Lucasfilm's new unified canon.
Lightsaber Rattling was the first to spot the text bubble in issue #150, seen above, that clarified the stories' status. As The Hollywood Reporter points out, that makes "Blade Squadron, Part I" the first piece of literature published in the new canon.
Star Wars Insider #181 Highlights
7/8 - Graeme Blundell
7/9 - Jimmy Smits
7/11 - Greg Grunberg
7/12 - Ben Burtt
7/13 - Harrison Ford
7/13 - Star Wars Celebration Europe (2007)
7/14 - Kristy Wright
7/15 - Forrest Whitaker
7/15 - Celia Imrie
7/15 - Star Wars Celebration Europe (2016)
7/18 - TROOPS (1997)
7/19 - Star Wars Celebration Japan (2008)
7/19 - Mark Capri