I will know more about 20nm this time next week when I meet with some people closer to the action. When I saw IMFT 20nm at Computex and played with a working drive you could tell that it was a lot slower than 19nm. At Computex 19nm was ready to go and we have proof of that now with the P5 Pro.

I wouldn't be surprised if we don't see 20nm until 2013....but they are still saying 2012 as of right now.