This is incredibly sad news for music. Wright was one of the greatest musicians of our time, and was very unfairly underappreciated for his fantastic work in Pink Floyd. As soon as I heard this, I dropped what I was doing and listened to "Echoes" in its entirety in his honor.
Rest in peace, Rick. You've gone to your last great gig in the sky (I know it's corny, but I had to say it).