https://www.sesarju.eu/sites/default/files/documents/reports/U-space%20Blueprint.pdf (https://www.sesarju.eu/sites/default/files/documents/reports/U-space%20Blueprint.pdf)
Interesting recent proposal. FWIW, the population of GA aircraft, and even rotor wing aircraft in the entire EU is perhaps a lot less than in the US. It is very interesting that the proposal would allow UAV ops over urban areas. Maybe this is a future that will arrive in the US sooner than later.