Normally I don't post rumors here, but I found this particularly intriging because there appeares to be proof.
Some users went data-mining after today's patch and found code for Instant Action with offline/CO-OP versions of Walker Assault & Fighter Squadron. Here you can see screenshots & video of the menus (the game presumably crashes when loding them, as they're not finished): https://www.reddit.com/r/StarWarsBattlefront/comments/4p5e29/offline_instant_action_coming_soon_to_star_wars/
And here's the original thread about it: https://facepunch.com/showthread.php?t=1500085&p=50559924&viewfull=1#post50559924
If this turns out to be true, i'm super hyped!
(Bear in mind, we don't know if this is indeed part of a future update and not cut content, so please don't make edits about it until we have confirmation from EA/DICE.)