Exploration Update
From Kerbal Space Program Wiki
The Exploration Update is the 4th of 5 currently planned major updates for KSP2 Early Access.
Features
The Exploration Update will add another new star system (likely either the Tuun System or the Qeg System, or potentially both) and "resource gathering".
Release Date
Currently the release date is unknown, but will likely be in more than a few months (as of 1/4/24).