It is also worth mentioning most or all backdrops were later reused in Bejeweled Twist. Without official sources, it is inconclusive calling it as an incomplete puzzle pack as nowhere does the installation process mentions an update to Puzzle Mode - perhaps a major backdrop update only.
Version 1.0 prior lacks such a feature, however. Version 1.1 was coded to have backdrops.lst updated with detection of new images being uploaded onto the backdrops folder, after executing the game. Besides these images, no such attachment or modification of files is done by the installation. Running the installer would place new files under the C:\Program Files (x86)\PopCap Games\Bejeweled 2 Deluxe\images\backdrops folder, which includes a variety of 12 new backdrops under the codename planetpack. According to this download source, with an included digital signature MD5 hash by PopCap themselves for authentication, Bejeweled 2 might have had a planned expansion pack that was scrapped for unknown reasons nearly a year after the game's release.
