Yes there is ...more than a hint.
The last volume of the Karabiner series is due to startup this fall.
Volume IV will be a follow up book to cover all the new material and examples that have come to light since the initial release of Kriegsmodell.
In addition, Stephan Hansen has done groundbreaking work on laminate suppliers, the Kriegsmarine, and other topics.
The tough part is how to create that volume as a follow up book but also allow it as a stand alone.
Stay tuned.