This will appear on Google.com for the rest of the day, and starting tomorrow it should be archived at http://www.google.com/logos/ .
Here's a Forbes article with more details about this tribute to Les Paul, and another from Geek.com.
Not to ruin the nice Coltrane vibe, but compare that to a saxophone playing robot. The video below shows the robot in action. The tone is awful, but it will give you some idea of what Coltrane is doing on the keys. Unfortunately it only shows the left-hand keys and we miss out on all the right-hand action, but you see can some of the high-note valves moving, which are operated by the right hand.