I admit to not having worked with Unity for a few versions now, but I am super impressed with what 5.1 looks like it can do. I recall seeing demo scenes for earlier releases and they looked impressive as well, but I couldn't ever find other people being able to replicate that level of visual gorgeousnesss. This latest version may be the same, but check out how beautifully the engine delivers the Blacksmith Demo! Apart from admiring the video itself below, the FAQ article has a bit more info for anyone keen to dig a little deeper and you have to check out the Concept Art blog post as well:
The Unreal 4.8 Release Notes outline a swag of new or improved features from new open world rendering enhancements including new grass and LOD handling through to the experimental procedural mesh system. There is lots here to get people's interest and I am particularly keen on all the environment changes and improvements to making larger landscapes work. I havent looked as closely at all the 2D tools added yet, but they could be heaps of fun for anyone working with that sort of game/project.
Anyhow, just look at how pretty these pics from the patch notes are (and if you havent seen the kite demo yet - it is below: