This has supposedly leaked from a Spanish site. Take it with a grain of salt:
PlayStation 4 Pro Compatibility
Better graphics
Posibility of having multiple ships
Share bases online
New vehicule: Exocraft
Permadeath mode
Build race circuits for vehicules
Ships and classes specializations
Shop / Merchants
Duplication of the variety in terms of the construction of the base
Multi-tool specialization and classes
New weapon modes
Photo Mode
Discovery Menu
Improvements in the quality of life
50% more original music than 65daysofstatic
The PS5 Exists.