The PC system specs for Deus Ex: Mankind Divided have been posted on Steam. Overall the system requirements look pretty mild. Preloading will begin on Friday, August 19th at 9:00AM PDT. PC system specifications are as follows:

Minimum:
OS: Windows 7.1SP1 or above (64-bit Operating System Required)
CPU: Intel Core i3-2100 or AMD equivalent
RAM: 8 GB
Graphics: AMD Radeon HD 7870 (2GB) or NVIDIA GeForce GTX 660 (2GB)
HDD/SSD: 45 GB

Recommended:
OS: Windows 10 64-bit
CPU: Intel Core i7-3770K or AMD FX 8350 Wraith
RAM: 16 GB
Graphics: AMD Radeon RX 480 – 1920 x 1080 or NVIDIA GTX 970 – 1920 x 1080
HDD/SSD: 55GB (Including DLC)

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Source: [H]ardOCP – Deus Ex: Mankind Divided PC System Specs