If you’re a very early backer, check your e-mail! The first invitations to Arena Commander’s multiplayer have gone out. QA invited the first 250 backers to start playing today. These backers were selected by the team because of their especially valuable bug reporting skills during the Hangar module release.

The team decided that reports were looking good and that we should begin the general rollout. Only a small number of Citizens have been sent invites at this point, but we hope to increase that dramatically in the near future. From this point forward, invites will be based on Citizen number in the aims of giving the earliest access to the backers who have supported us the longest.
 
Source:  "click here"