Yamaha usually release their TOTL & the MOTL during autumn (fall) and it was the T3 turn last year.
Dealers always get a look first so as to try and iron out any problems, therefore they could well have been shown at Winter NAMM & Frankfurt, but would have been in a closed Dealer section. (The dealers also have to sign to keep the secrets until official launch (As an example, Yamaha UK had to get special permission from Yamaha Japan to show the T3 at last years Pakefield Festival, as the show occurred before official launch date (The same applied a few years earlier with the release of the S900/700)
Regards

Bill