They haven’t mentioned anything about the possibility of it affecting current leases but it really wouldn’t surprise me if the changes in July spread across all users at a later date (Such as the end of the year or next year) if they found it successful for shoving more money into their pockets, like Drive Smart and the tyre policy.
The latter of which is being cut to 6 tyres in 3 years and only a maximum of 4 for pothole or curb damage which certainly doesn’t make life easy for high mileage drivers who have cars that eat tyres such as the Enyaq 4x4s.