It seems that Universal Studios Japan is prepping for a press event related to Super Nintendo World.
A fan posted a few photos on Twitter of a live-sized Super Mario World taking shape in the park. The press event may reveal more details about the new Super Nintendo World, such as attractions, location within the park, or possibly when construction will begin.
Super Nintendo World in Universal Studios Japan is expected to open by Summer 2020.
Stay tuned for any updates from the press event as they become available.