Second star system
The second star system is the third star system (Including Kerbol) in KSP2. The name has yet to be announced. It will be added in the Exploration update.
Current Information
The only information on the second star system is that it will be added to KSP2 right after Deb Deb. Although not confirmed, the possible planets orbiting this second star are Lapat and Ovin.
Lapat is theorized to be apart of this system because it has multicellular "vegetation" on the surface, which could not have arisen in the very young Deb Deb system.
Potential Planets
In one image, a planet is seen. The planet's name is not clear, but the planet seems to be called Axod. It is unknown if this planet is in Debdeb or the unknown star system. Other potential planets include Puf and the Rask-Rusk binary system.