A little clip from the Warhorse stream yesterday with Prokop and Tobi where they talk about Tom's final day working on KCD2. Take note of the emphasis on "KCD2", and the "at this moment".
Of course this isn't a guarantee of anything right now, but there have been so many little things, such as Tom saying in an interview that they have a good idea where Henry's story is going, or Tobi saying it would be a shame to leave the IP. Nothing is set in stone until it's actually done, but we can be confident that they are at least kicking around ideas for the future of KCD.
At this point I feel like there's a damn good chance that Tom will indeed be back working with Warhorse again in the future, even if it ends up being on something else. That's still very much something I'll look forward to seeing.