Look guys there is only one reason the T range is made out of plastic, "BIG NUMBERS" we are talking 1000s not 100s, the T4 will be made in big numbers, people who make KBs from metal don't have their sights set too high, the cost of the tooling for a T3 case would be more than the Audya turnover in a year. Also if Yamaha do have a T4 coming on the market you can bet that Korg will have a new KB too.