So in the final updates of KSP 1, some mods were essentially introduced to the base game such as KAS (Kerbal Attachment System) and Kerbal Alarm Clock. Some of Kerbal Engineer Redux’s features were also introduced.
For KSP 2 I was hoping for a trajectory system, similar to the mod, which accounts for the impact of atmospheres and accurately depicts the landing site of a spacecraft. This will be important, especially for colonies where players will need to land on landing pads.