One of the first games to get the DirectX 12 upgrade is none other than Rise of the Tomb Raider.
By adding DirectX 12 support to Rise of the Tomb Raider, processors will be able to spread CPU rendering work over all CPU cores, without introducing additional overhead. This will enable users with high-end graphics cards but low-end CPU to run the game at higher frame-rates, graphical settings and other technical enhancements like never before.

This update is available first through today's automatic Steam update for the game. It will come soon to the Windows Store version.

The rub with this update is that you need the latest Nvidia driver release (364.51) which has had a number of adverse issues reported about it. These issues include a number of system crashes, especially for those with more than one monitor. I will suggest only that users wait until Nvidia releases a non-buggy driver update before proceeding forward with trying out DirectX 12 in Rise of the Tomb Raider.

More details can be found at the Tomb Raider blog.