The new law is to come into force on July 23. Belgium will be the second EU member state to pass this legislation, the first one being France. As it happens the estimate is that only about 270 people were the niquab or full covering in the country. (Though, their own communities do not consider them as people but as women who do not have the same rights as men and who have to be separated from society.)
Incidentally, Belgium still has no government but seems to be managing as well as ever.