The print speed is the most noticed improvement. I am glad they finally debuted it. Basically it is the 1604 with a firmware upgrade which is supposed to increase the print speeds about 20 sq ft an hr. Normal print speed for that printer is roughly 185 sq ft an hr, with the new FW it should be about roughly 200 now. The vertical ink carts are nothing new, they havent been able to sell the units with it yet because they were working out some bugs. I saw this unit at the Long Beach show last year. Pretty cool.