dammit! I have the complete edition disc and no PS4

Yes, base game needed. it's just like other expansion packs like Blood and Wine and Hearts of Stone.

Updated System Requirements (PC) Due to the new additions, the base game's minimum system requirements for PC are being updated to the following: OS: 64-bit Windows 11 Processor: AMD Ryzen 5 2600 or Intel Core i5-8400 Memory: 12 GB RAM Graphics: NVIDIA GeForce GTX 1660 or AMD Radeon RX 5500 XT 8GB Storage: 70 GB available space on an SSD (HDD is no longer supported)

This came out of nowhere. Does it need the base game or standalone?

Played the first 3 missions, game is awesome excellent Gunplay, stealth, gadgets... runs rock solid 60 fps