Talking to the head of ops for S2 (Apocalypses sector of the park) it is confirmed that Apocalypse will close at the end of this season, partly due to the parks new direction with looping, and partly due to prevailing mechanical issues. Pandemonium went this season, as they need Pandemonium's pad to put the cranes on to remove Apocalypse. There will not be a permanent new ride on Apocalypses pad, as they need it clear to take out Apocalypse in the 22/23 off season, with the aim of using the site for a larger attraction on the old site of both, possibly including the test track site. It is unknown by my source when the new attraction will come in, but the 24 or 25 season does not seam illogical, and if it was on the 25 season they could use it for the parks 75th.