From the Rocket League website:
In Rocket League Sideswipe, players compete from a new perspective on the field in 1v1 or 2v2 matches. Games will be fast-paced, 2-minute matches that you can play with friends near or far thanks to online play.
Starting today (March 24), players in Australia and New Zealand will be able to join a limited-time Regional Alpha test on Android via the Google Play Store. We’ll have more information on future betas in additional regions in the coming months.
Thanks to froogletom for the heads-up. Unsure if deal or forum post.