Gradius!!! The mod is AWESOME! Changes things quite a bit and it also makes the game a little more challenging in some places and a little easier in others. Combat is more responsive and you don't need to rely on rolling around that much to stay alive any longer (it is still needed from time to time, but not as much), in tougher battles Geralt will spin away from enemies instead of rolling. The mod also addresses a few issues with balancing that makes the learning curve a little better.
Although Witcher 3's combat will change a lot from 2, this mod has nothing to do with Witcher 3. CDPR said that they basically redesigned the combat from the ground up for Witcher 3. Like I said, it was made by one guy (Flash) who is known in the Witcher modding community for his excellent Witcher 1 FCR (full combat rebalance) mod. He is now working at CDPR as a gameplay designer on Witcher 3 (I think, might be wrong about his specific position).
Enjoy the mod! Just remember that you can't play the tutorial with the mod as you can no longer parry like the tutorial asks you to so just skip the tutorial. Not sure if Flash fixed this with an update to the mod, but I just thought I'd mention it.






