Microsoft's own Channel 9 has just posted two videos from a discussion with the Volta development team.  You'll learn more about what Volta is, how it works, and how to write applications with it:

Tier Splitting Volta: Who. What. How. Why - Part 1

"In this episode (or part 1, if you will) we meet the team and learn the basics. Since it's a room full of devs there is whiteboarding and lots of techincal talk, just the way we like it here on C9."

Tier Splitting Volta: Who. What. How. Why - Part 2

"This is part 2 where we continue to dig deeply into Volta. Lot's of whiteboarding and even a code sample using VS."