Interstellar Update
From Kerbal Space Program Wiki
The Interstellar Update is the 3rd of 5 currently planned major updates for KSP2 Early Access.
Features
The Interstellar Update will add the Deb Deb system and the parts needed for interstellar travel.
Release Date
Currently the release date is unknown, but will likely be in more than a few months (as of 1/4/24).