Starting January 7, Rise of the Tomb Raider will be bundled with the GeForce GTX 970, GTX 980, GTX 980 Ti, and gaming notebooks powered by the GTX 970M, GTX 980M and the desktop-based GTX 980.
The news is coming from the most recent email blast from NVIDIA, which states that the next NVIDIA promotion will be Rise of the Tomb Raider, kicking off on January 7.
Email going around in which the next Nvidia promo will include vouchers for Rise of the Tomb Raider, starting January 7th, 2016.
Can't post a source, but the news will definitely hit soon.
EDIT: To clarify, the game will be included with GTX 970, 980, 980 Ti, and notebooks/laptops with 970M or above GPUs.