Just got the new ones, here is an album of the box differences and some other stuff I noticed. Click to see a larger photo.
I am not going to make any detailed comments on the sound for now, I need more time. But, I will say they sound fairly identical. If you like one, you will like the other.
Left: Preorder, Right: Production
Preorder one says HE560, new one doesn't and is a bit less tall but deeper, both boxes had scratches and marks when I got them.
Preorder version has thinner foam and one cutout. New one has two separate foam cutouts, one for the headphones and one for the cable. The foam is harder and stays in shape much better than before.
Molding lines on the preorder HE560
Production HE560 has no molding lines
Preorder version has the seam from one of the pads sticking out, new ones are symmetrical and the seams match. There is also plastic where the connectors are located on the new one.
From left to right: HE560 preorder, production HE560, and HE-4
Production version has a fabric coated cable, same connectors (neutrik) on both. The production HE560 feels the same as the HE-4 cable but it weighs more.