Found this in their recently posted Q&A Update:
Q. The modding goal is at $800K, which is quite far away. Does that mean there will be no modding if you don’t reach it ?
A. The $800K modding goal is for “full” modding, completely changing the gameplay or even making new types of games and total reconversions ( like adding walking on planets/stations ). Even if we don’t reach this goal, there is still going to be partial mod support in the game. Players will be able to customize their own dedicated servers, add or modify ships, weapons, planets / solar system setup, sounds and special effects… this includes the look but also all the gameplay / balance / physics parameters. The gameplay however will pretty much be set in stone until we get more funding.
PS: Last chance to get in. Kickstarter ends in 17 hours