NVIDIA just announced some great info at GDC 2019. 
Here are some key messages:
Integration of real-time ray tracing into Unreal Engine & Unity, the world’s most popular commercial game engines.
NVIDIA is adding ray tracing support to GeForce GTX GPUs, giving developers a massive installed base of tens of millions of gamers....
New games and experiences that showcase real-time ray tracing including Quake II RTX, Dragonhound, and Control.
The introduction of NVIDIA GameWorks RTX. See More
