Wow, that Leadwerks clips are amazing. I hope they still are at a higher quality.
That Unity level on the other hand again istn´t that awsome. The terrain is very lowpoly and the trees are rendered using impostors already at a very short distance. On the other hand it shows that unity has a very well working and only hard to notice impostor system, even at that short distance used in that level. But I think that the creator should have faded out the massive foliage which is actually the only really amazing thing of that level and should instead have raised the LOD distance for the trees. It has a good atmosphere though.