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

Medallion's humming... that can only mean one thing! It's time to announce The Witcher 3: Wild Hunt - Songs of the Past! This brand new expansion for The Witcher 3: Wild Hunt will take you to the Path with Geralt of Rivia once more. It’s being co-developed with Fool's Theory and is coming to PC, Xbox Series X|S, and PlayStation 5 in 2027. Stay tuned for more information in late summer. With new content coming to the game, we also need to update our system requirements to ensure smooth performance and compatibility going forward. These requirements will become effective starting from the next update. "We originally planned to make this big reveal during our REDstreams tomorrow, but let's say we found something we didn't yet expect on RED Launcher." https://www.rpgsite.net/news/20451-the-witcher-3-wild-hunt-songs-of-the-past-expansion-2027-release-announcement