Muur and Bosberg would only be possible if the start is in that region. A Brussels newspaper opted that the race would be heading towards the birthplace of Remco. Muur and Bosberg are not very far from Schepdaal. Also, the frontier with Wallonia is nearby.
But the hills from Brabantse Pijl combined with some hills in Brabant Wallon seem more likely. Overijse and Hoeilaart , and nearby Walloon cottages Rixensart and Limal, have some nice hills.
Most difficult Brussels hills, Kauwberg included, are in and around Ukkel/Uccle, So I think the local circuit Will include Ukkel.
Thomas VD Spiegel said in an interview they already have an idea but they still have to talk with the regio's Flanders and Wallonia.