Metro Retro v2 is the premium version of Metro Retro, and can be accessed with a subscription. v2 is in Early Access for 2021, and will finish in early 2022.
The Early Access program is available to anyone that wants to be an early supporter - they get to use the new features earlier than everyone else and provide input to the roadmap. They will remain VIPs for the lifetime of their subscription.
If you would like to know more details about Early Access, pricing, and how to join, please sign up at the Early Access page or email [email protected]