I am not one to care about aesthetics these days, but I will openly say that this is the nicest looking snowboard I have ever seen. The new short board has the same unique riding sensation as the original long 6' board yet it is easier for lighter people to ride it tighter situations.
The short 167cm D1 has almost exactly the same shape as the long 179cm D1. It appears to have almost the same side cut radius, the same contact points, the same waist width, same effective edge. In fact, the widest point of the nose is the same distance from the tail in both boards. Besides the length, the longer D1 simply has more nose volume. The tail is the same width, however the 157 is perhaps 4mm narrower as it runs up to the waist. Conversely, the black board is about 4mm wider from the middle point between the bindings until the widest point of the nose. Basically, the white board is 10cm shorter and has a slightly narrower bottom half and a wider top half.
In terms of construction, the short D1 has a cambered or angled sidewall whilst the long D1 has a square sidewall. I don't know what the technical terms is for this. As far as I know the flex is the same in both boards.
Despite so many similarities I found the ride to be a qiute different. I am light: 65kg without back pack. The short D1 felt much more lively under my feet. This came as a surprise as the area of the board in contact with the snow, particularly the effective edge, is identical for both boards. Yet I definitely found the shorter D1 easier to ride. However it still has the same powerful on-piste carving ability as is commonly reported for the long D1. For a powder board the D1 (long and short) really does outperform most normal freeride boards for powerful piste carving.
Off-piste, where it matters, was also a great experience. Over the day I rode a mix of low angle powder, 35 degree straight lining over chop, long easy curves on untracked 25 degree slopes and plenty of tracked out and chopped up fresh snow. In all cases I could ride as fast or as slow and easy as I wanted. The board turns extremely easily without all the rear leg laboring or off-set stance positions of a normal board. You still ride the short D1 with a centered stance and can still add considerable acceleration by weighting the front foot. Try that on the standard freeride shape and you will bury the nose. The D1 is a surfboard for snow.