I think Eloi's video shows off all the new features quite nicely - enjoy:
There's also a new Arnold version with GPU support you can download.
Note two things: First, the version version does not come in-the-box with Max, you have to download that update yourself; This is because Arnold has a much faster release cycle than max itself, and a much leaner release pipeline, often leading to this seemingly "strange" situation where there is a brand new max release, yet on day 1 there is also an even newer Arnold release.
Secondly: The GPU functionality itself is considered Beta. I.e. it is not considered finished, but can be tested and played wi…