For the sake of modding

[Zoft]

We are thinking a lot about modding, you don't need to worry

 

[LordMune]

I wonder, will the game use paradox scripting language or something more powerful like Lua or C#?

The scripting language should be familiar to anyone who's modded other Clausewitz-based titles. There will of course be a lot of Stellaris-specific functionality (because space) and some general quality-of-life improvements over past games.