As always, I am a bit skeptical. I mean the demo is nice and everything, but unless they have techniques in the engine the make it running on 8GB without nvidia titans, there is nothing to be excited about. Any engine can create sth. like this if you feed it with endless Ram and the latest and greatest gpu(s). This demo makes really only sense if it can run on hardware that is not overpowered. See open world games…they are running in normal powered hardware (8 GB is what most people have, imo) because they have good techniques in the engine, see the latest witcher title.
To just dish out a open world demo and say ‘yes, but you need min. 16GB ram and a titan, or better two of each’…well, reply would be ‘thanks, keep it’