Perhaps Vengeance might just end up back at London Dungeons next year - I'm sure there is space for it somewhere. Extremis might make a good addition at Chessington somewhere, perhaps there is space in the Hocus Pocus Hall building for it to be included within the attraction somehow, oe maybe the Vampire/Tomb Blaster 'shed'.
Edit: I managed to find this http://planning.lambeth.gov.uk/online-applications/applicationDetails.do?activeTab=externalDocuments&keyVal=MD6OE2BOHV000. They are the update plans of the new dungeons.
Judging from these plans, I think those who went to the preview day yesterday only experienced around half of the entire Jack the Ripper shows somehow. All I remember from yesterday was:
but there seems to be 5 Jack the Ripper shows.