Above is an image on how the changed URL format would look like, please note that you can get the “DetailRouteKey” in any way you want and feed any string into the URL at this moment.
Also, as above note that new products added to the system will getnew URL format by default but already existing products doesn’t change the URLby default. You will have to republish the existing products to get the new URLformat.
Hope this helps,
Cheers
Venkata