According to the blog post, the Star Wars Battlefront open beta will include Walker Assault on Hoth, Drop Zone on Sullust and Survival Mission on Tatooine game modes. The open beta will allow the team at DICE to test various aspects of the game as well as the online infrastructure. DICE also noted that players might experience interruptions in the gameplay during this beta phase.
The earlier details Companion app will be only available via the official website and feature strategic card game Base Command that will allow you tuo unlock Star Cards, weapons and other things from the game as well as let you check out you stats, game progression, customize load-outs and more.
All players will be limited to level five cap and stats and progression will not be carried over to the final game.
Those coming from the PC will be able to pre-load the game from Origin as of October 7th. The Playstation 4 beta will be available at the PSN Store while the Xbox One can be found at Xbox Live Marketplace.
Be sure to mark those days and in case you can't take a few sick days off from work, bear in mind that October 10th and 11th are weekend days.