I visited Tayto Park's Halloween event last night and saw that construction work has started inside the park - given that there hasn't been nor would I expect any other major announcements for next year; I assume this must be the site of their 2019 Zierer Family Coaster.
The Zip Wires have been removed, the towers are still standing but the actual wires and landing platforms/strips are gone (+ they are no longer on the map or website), and beside the tower closest to the park entrance land clearing and digging to create a flat surface has taken place.
Lit up lifthill of Cu Chuliann in the background.
There are a number of orange pipes for utilities/electricity connections sticking out of the ground.
I've drawn the construction site on this aerial view to better demonstrate its size of and its location compared to Viking Voyage, Cu Chuliann and the park entrance.