Based on recent comments by Soni Games
TWO 24CT GOLD AND WHITE DIAMOND COLLECTIONS. See video Each collection consists of 4 pieces, each puzzle is a fully working mechanical piece covered in 24ct gold with 5 white diamonds set into each puzzle. The fifth will be added to both collections at no additional cost when released in 2019
It looks like the release date for the Fith puzzle is getting further and further away .....2019, another 3-4 years, this is too long!