Rock, Paper, Shotgun has a short article about Kingdom Come: Deliverance, and modding.
More information.Speaking with RPS as part of an interview, project director Daniel Vávra revealed that mods are a-okay in Warhorse’s book leatherbound historical tome:
“We are quite open to modding,” he said. “Since it’s on CryEngine, it should be easy to mod, too.”
But what about an even easier-to-use Kingdom-Come-specific toolset? That idea is still up in the air, but Vávra's definitely going to push for it. “We hope that we will be able to release our tools and assets for CryEngine SDK. No guarantees now, but it would be a shame not to do it.”
He also mentioned that he’d be interested to see players make the game’s survival elements more life-or-death, replicating a DayZ or Fallout: New Vegas JSawyer experience within it.