It had to do with trying to show off the level of detail.
The head of Xbox seems impressed.
"It feels like two generations of improvement in quality, because of this new technology we’ve been able to bring to life," says Epic Games' chief technology officer Kim Libreri.
Now, this is "next-gen" graphics and visual fidelity.
The engine also promises a lot of scalability.
Boasting improved geometry, global illumination, and much more.