This isn’t about adaptive icons. We are still working on those. This is about the 512×512 that you upload to Google Play. Google is changing the rules on what is required for the developer portal. Previously they allowed you to have arbitrary shaped icons, but as of May 1, you’re required to provide a square shaped icon. You can read more about the new requirements here.
Google Play’s new icon requirements!
.btn_cta { border-color: #f96f29; background-color: #f96f29; color: #fff !important; padding:15px;}