Kyuuranger's theme involves planets and technology as each Kyuuranger has the power of each planet. In short, expect a total of 9 heroes for this team. The core team is composed of Red, Blue, and Yellow, and each protect a planet. The team transforms using the NovaKyu Changer and new heroes will be revealed in pairs. Lastly, their spacecraft looks similar to the planets they protect and the main mecha looks like a UFO.
Take note, official Kyuuranger information will be likely to be revealed by late November or in early December as there is a possibility that the team will make a cameo appearance in the upcoming Zyuohger vs. Ninninger movie.
[Source: J-HERO, SpecialForm12 (link 2, link 3) via RangerCrew]