Char
From Kerbal Space Program Wiki
Char is a new exoplanet in KSP2 it is the innermost confirmed planet of Deb Deb a new star system.
Charr is an airless "Heat blasted world of iron.", Char is likely rich in iron and other heavy metals making it a great body for mining in the Deb Deb system, Giving players a incentive for players to go to char, despite its proximity and likely high delta v requirements.
No details on its size has been given.