In a similar fashion like Switzerland there is now a highly detailed open source dataset available for all the buildings in The Netherlands.
It is the result of a project of TU Delft, a big (aviation) technology university in the Netherlands.
https://3dbag.nl/en/viewer
LOD 2.2 as they call it even contains the info on sloped roofs for example.
Probably too late for this data to be included in the upcoming World Update but maybe at a later stage...
Regards,
Sylvain