I don't think there is anything on the net for public view yet. My dealer faxed me a 4 page spec and brochure with pictures showing all the improvements. I think you have to be a dealer to get to this stuff. Case still has some of the 2200 to sell so they are not advert the 3200 yet. Go to your local dealer and b***h about the 2208 like I did and they should be able to pull off a brochure for you on the 3200 and 3400.
3200/3400 still use the same gathering chain.
The roll design is knife to knife like the 1000 series is but the knives are 24" long and the front auger design has seen major redesign to improve feeding and extend the life of the leading edge of the knife.