This is not in any way an official answer, so take with a grain of salt.
Franz Joseph ship designs are licensed from FJ Designs AND Paramount, so they typically are released in sets containing only FJ ships. The FJ ships are the Federation tug, scout, middle years dreadnought, and (I think) heavy cruiser. I would imagine that you will probably see these ships released as one boxed set together when and if they are released.
As for the Klingon tug (and the rest of the tugs), I'll leave it for Jean and/or Matt to comment on that, since I just don't know.