Having the OpenStreetMap basemap is great but it would be good if Pro had ability to download OSM data for an extent into a local FGDB. That would allow user to easily use that data with their own cartography suitable for the maps they create, without having to use other tools to download the data. As an additional bonus it would be great if it could get bundled into some kind of layer package with default symbology already defined.
City Engine already gives user the ability to download OSM data for the area you work on, so hopefully Pro can provide the same.
Ability to edit OSM data in Pro could come later. Just to get a copy of it would be a good starting point.