They have had this technology for a decade or so now but have never been able to get the reliablility of the product or the manufacturing process to a point where it is economically viable. This is one of a few new technologies fighting to be first to replace LCD.
Just remember, Plasma was invented over 20 years ago and how long have we had LCD in our little calculators before they developed it far enough to get colour or any reasonable size out of them, and they still cost too much. Even modern LCDs have close to a 50% failure rate during manufacture of the raw panel, which is one of the main reasons they still cost so much and haven't dived in price like plasmas have.
