For the Franz Joseph ships the most logical thing to do would be to put them out in a squadron box with a 2 sided sheet giving the stats and make it available online. This means that the people who want the FJ ships can easily get hold of the rules for them and it doesn't tie them into a specific book release.
It also means if you've got a release that's a bit thin on the ground for the Federation, like Battleships, then you can put it out around that time, or save it for a Nov/Dec release to give Fed players something for Christmas and have something out there for a fleet that will be in the top 3 sellers.