There has already been mention of custom signs but I would just like to speculate on how they could be made.
Many of the signs for some of the flat rides in the game appear to just be an extruded flat image. So maybe there will be a way of us drawing/Photoshopping our own signs, exporting them as .png (images with 'see through' backgrounds instead of white) and the game will extrude them and put them in the signs menu.
This would enable true custom signs. You could even do multiple extruded signs and layer them up to get really complex signs.
Many of the signs for some of the flat rides in the game appear to just be an extruded flat image. So maybe there will be a way of us drawing/Photoshopping our own signs, exporting them as .png (images with 'see through' backgrounds instead of white) and the game will extrude them and put them in the signs menu.
This would enable true custom signs. You could even do multiple extruded signs and layer them up to get really complex signs.