CD Projekt RED has spoken out about The Witcher 3 mods on consoles, but they also had a lot to say about the mod tools that they are releasing for PC.
These mod tools aren’t going to be as intuitive to use as Super Mario Maker, but they go farther too. While they make creating mods easier, they are intended for gamers who already have experience with modding software. Now, they do give modders access to the game files, such that the process of extracting, compiling, and decompiling resources is completely covered.