While we don't yet know the absolute minimum specs, you should be able to get a consistent 30 FPS with at least this setup:

Processor: AMD A8 5500 APU 8GB DDR3 RAM

Memory: 4 GB RAM

Graphics: AMD Radeon HD 7560D

To run the game at a consistent 60 FPS, the recommended setup is as thus:

Processor: Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz (8 CPUs), ~4.2GHz

Memory: 8 GB RAM

Graphics: NVIDIA GeForce GTX 1060