There is a video on the other Enyaq thread from a guy on YT who Skoda has given official information regarding specs etc.
Skoda has already confirmed ME4 is a hardware upgrade(not just software) and because of that will never release onto existing models.
The guy on the video confirms that ME4 is only for 85/85x models as part of their hardware changes.
He states IV60 keeps its existing drivetrain and existing ME3xx software.
There maybe possibility for future UI updates to ME3xx to improve the user experience but ME4 isn’t just software.