Danny has done the final art pass on the Octopus Arena. It was the first arena we ever made, and now its much more in line with how our art style has evolved and running better. Here are some shots of the previous version: 1, 2, 3. Going back further to the original map 1, 2.
The trees are created using SpeedTree. The bushes are a custom shader based on our grass shader (similar to Shadow of the Colossus fur).The sand is also a custom shader which has the layers of sand (wet, glistening and standard) blending into the grass for the path up the hill.
You also get a peek at the more readable design of the Spawn platforms (with life count) in those screenshots. Here is what they used to look like.