I recently sent Dark Horse an e-mail regarding their plans for Indy in the near future and this is the reply I got:
Hi David,
Thanks for the email!
We are always grateful when fans let us know that they enjoyed one of our comics. As for Indiana Jones specifically? Unfortunately, there are no plans at this time for new comics, but that's certainly in the cards for the future.
We appreciate your interest in Dark Horse Comics.
Best,
Spencer
Dark Horse Comics, Inc.