We haven't heard an ETA, no. They updated the main website recently and they'll be at Comiket 81 this winter, so I'm anticipating at least a new demo.
But yeah, Territoire is just about at the three-year mark for development; they've basically been working on it as long as they worked on the other three "original-content" games (Chantelise, Recettear and Mail Angel) combined, and it'll be longer if it doesn't drop at Comiket 81, which I suspect it might not. On the other hand, it's shaping up to be literally the most ambitious independent game project in Japan in, like, a decade, so I'm impossibly excited for it.