Samsung is showing a new OLED TV prototype that is 40" and is high defintion - 1,920 by 1,080. Samsung already showed a 40" OLED in 2005, but the resolution was not so high.
The new panel has a contrast of 1,000,000:1. Samsung doesn't say when they'll commercialize this - only that they don't have plans to do it now. They also said that the 40" is the largest size they can produce, currently.