Spotted by Videocardz.com, it is unclear when the promotion will start,  but since the game just launched a few days ago we expect that Nvidia will officially announce the promotion soon.

It appears that both desktop Geforce GTX 1080 and GTX 1070 graphics cards as well as notebooks with Geforce GTX 1080 Mobile and GTX 1070 Mobile graphics cards will be included in the promotion. In case you missed it, AMD has just launched a new game bundle promotion which gives a free Sid Meier's Civilization VI with a purchase of a Radeon RX 480 so this can be considered as an answer from Nvidia.

As was the case with previous promotions, this one will also be limited to select markets, certain retailers/e-tailers, and partners so we should wait for more official details from Nvidia.