I just saw it happening live on the YouTube channel of the 2018 State of the Map in Milan. Belgium now is officially accepted as a local chapter of the OpenStreetMap Foundation.
Martijn van Exel, secretary of the OSMF said: “We are welcoming OpenStreetMap Belgium. A local chapter is really important to the foundation and also to the local groups themselves for boring reasons and important reasons. One of the most interesting reasons is to assert your alliance with the openstreetmap foundation and also to be part of the network of the local groups that form openstreetmap worldwide. I am really excited.”