I just got delivery of my K-Sigs today, I got 2 boxes of the 4-piece and two of the 3-piece.
Good news - the 4-piece ball is the exact same as the original!! Same markings, same packaging, and hits and feels exactly the same. I've hit these balls thousands of times on the course and in my simulator and know exactly how they feel, and these are the same exact balls. I would bet a lot of money on it!!
Bad news - the 3-piece balls suck. They don't feel good, clunky/hard on impact, and they are a good 15-20 yards shorter than the 4-piece! Minutes after getting the balls I fired up my simulator and hit 10 balls with the 4-piece and ranged from 160-170 with my 7-iron, which is right where I always am. And then I hit 10 balls with the 3-piece ball and ranged from 145-155. My longest shot with the 3-piece was shorter than my worst shot with the 4-piece!
So definitely snatch up some of the 4-piece balls while you can, and steer clear of the 3-piece! π