BP costs of various Starship weapons got adjusted. Say goodbye to your Coilgun overlords. These changes are pretty massive. High explosive missiles went from 4 BP to 14 BP, for example. Heavy laser cannons cost twice as much.
Starship Weapons with the EMP property got a lot cheaper and the EMP property has been changed to be slightly more powerful.
Paizo just updated the core rulebook pdf, and there are a number of balance changes being discovered, some of which are for starships.
https://paizo.com/threads/rzs2ur2e&page=1?The-Starfinder-FAQErrata-is-up
some relevant snippets: