It doesn't look like it. While he had planned to do two more Trevor Lawson novellas, his departure from Subterranean likely means they won't happen. But who knows? His plans have changed several times, so anything's possible. Time will tell!
Thanks again for all your insight. By "likely won't happen" do you mean ever or just before the Corbett series is completed? It would be a real shame if the TL series wasn't finished. Those are fun, graphic novel type stories.