Ubisoft has finally released the pc specs needed in order to run AC Syndicate. The game is slated for release on November 19th. Minimum specs are a little steep but the recommended ones aren't too bad.

Source: ubisoft.com
Minimum settings:
- Windows 7 SP1, Windows 8.1, Windows 10(64bit versions)
- Intel Core i5 2400s @ 2.5 GHz or AMD FX 6350 @ 3.9 GHz
- 6GB or more for Windows 7, Windows 8.1, Windows 10
- NVIDIA GeForce GTX 660 or AMD Radeon R9 270 (2GB VRAM with Shader Model 5.0)
- DirectX June 2010 Redistributable
- DirectX compatible sound card with latest drivers
Recommended settings:
- Windows 7 SP1, Windows 8.1, Windows 10 (64bit versions only)
- Intel Core i7-3770 @ 3.5 GHz or AMD FX-8350 @ 4.0 GHz
- 8GB RAM
- NVIDIA GeForce GTX 760 (4GB) or the newer GTX 970 (4GB) or AMD Radeon R9 280X (3GB) or better
- DirectX June 2010 Redistributable
- DirectX 9.0c compatible sound card with latest drivers
- 50 GB available space
Technical note from the developer: For a recommended experience, the game requires a video card with at least 3GB of VRAM when playing at a full HD resolution. While we encourage you to fiddle with the advanced options to fully customize your gaming experience, please keep an eye out for the VRAM meter usage when you adjust these settings.

Source: ubisoft.com