It looks like that some LSM fins are being mounted on the top hat. They don't look like the usual trim brakes. Maybe this is a new way to adjust the speed of the trains to make sure they make it over the top hat in all conditions.
Source: https://orlandoparkstop.com/news/rumors/velocicoaster-construction-update-full-trains-on-track-raptor-eggs-and-entrance-framing/