The W23 page lists the items
Get your hands on our limited-time GURPS Bundle featuring formerly out-of-print GURPS products. In this bundle, you will receive eight softcover GURPS titles: Magic, High-Tech, Bio-Tech, Ultra-Tech, Thaumatology, Infinite Worlds, Mysteries, and Spaceships. In addition, if you pre-order during the limited window, you will also receive free hardcover copies of GURPS Basic Set: Campaigns and GURPS Basic Set: Characters.
The pre-order window is from April 27th to May 7th only. After the pre-order window is closed, shipments will be processed and mailed within 2-4 weeks.
Note Advertising copy as they wrote it better than I would.