If you're not familiar with EA Access, we can inform you that it's an Xbox One exclusive subscription that lets you try out new games from EA a week prior to release. It's usually ten hour's of access to the full game. Also subscribers get to play a collection of EA titles for free (not counting the subscription fee of course).
DICE's upcoming Star Wars Battlefront is a part of this deal, and now Microsoft appears to be handing out one month trials for EA Access to Xbox Live members. This is reported by users on Reddit (and picked up by VG247) who claim they've received emails with offers of a one month free subscription.