Thank you Arnaud, for the elegant translation, which is largely accurate, including the innuendo and hesitation common to the Japanese idiom. In reading the original Japanese, the only thing that STAX says with certainty is that a new amp is forthcoming, hopefully on sale by next summer. They are "developing" a DAC function in the driver, but again, nothing certain. The 2018 anniversary is simply a provocation, with no commitment beyond the wish to do something commemorative--
Comments on the 4070 were particularly frank, seems they'd abandoned them even before finishing production.