As I said before, and now it's even more correct - we're now in that limbo phase where it's only logical to call The Astonishing the last DT albums, but there are five guys who happen to disagree. And those five guys are the DT members, who have a finished product in their hands of which they know title, songs, general direction and, if not already the artwork, they most likely have an idea of what they want for it.
There is a DT14 out there!!! it's just not ready for the world yet, but the successor to The Astonishing already exists!