Relatively minor changes, but a decent amount of them:
* Increased max parts to 1,000
* Increased save vehicle slots to 450
* Added "Place On Hold" option to speed up large builds (enabled by default)
* Added 2 new parts: Mini Beam and Mini Heavy Beam (contract the Half Beam to use them, not intended for common usage)
* Fixed issue with Undo overwriting some settings on parts (controls, angle limits, etc)
* Added more camera shake options (High is the old default, Low and Medium are now)
* Added Camera Invert X/Y options
* Moved the Vehicle Reset button to the bottom left to prevent accidental deletions
Source: Steam Community (opens in a new tab)