I'm currently taking the Shenmue 3 survey and in it I spot the minimum PC specs. I haven't seen any recommended specs tho.
click to enlarge image: https://i.imgur.com/G9lamSD.png
PC system requirements
OS: Windows 7x64, Windows 8x64, Windows 10x64 (64-bit OS Required)
Processor: Intel Core i5-4460 (3.40 GHz) or better; Quad-core or better
Memory: 4 GB RAM
Graphics: NVIDIA GeForce GTX 650 Ti or better (DirectX 11 card & VRAM 2GB Required)
DirectX: Version 11
Network: Broadband internet connection
Storage: 100 GB available space
Sound card: DirectX 9.0c compatible sound card
Additional Info: Requires Steam Client to activate.
*Game is currently in development so system requirements may change without notice. We thank you for your understanding.