Plopsaland de Panne have recently outline their plans for the next few years, which includes a new coaster for 2021:
From the look of the image and what people have been reporting, this is gonna be a Mack Xtreme Spinning Coaster. This will be the first one in Europe and only the 2nd one ever built after Time Traveler at Silver Dollar City.
Source: https://twitter.com/plopsafansbe/status ... 6240671747