Well this could be interesting, Project XCloud Microsoft's game streaming platform. As well games like Halo! and GoW we will be able to play Sea of Thieves on our phones or pads! Either connected to xbox controllers, bluetooth or touch and may work on 4G. Testing in 2019 so I guess out by 2020 where 5G would probably be available by then.
But anyways games on the go sounds pretty cool!
Project xCloud: Gaming with you at the center - The Official Microsoft Blog
I wonder if Forza in that setup has motion sensors, tilting the controller/ screen for steering round corners!
