The new inkset was made for the Pro-1 which was introduced prior to the Pro-100. After the Pro-100 the Pro-1 sat as the 13" pigment machine. Ask the Hat when he bought his. Then the Pro-10 was introduced and then after a while Canon pulled the plug on the Pro-1. Initially the Pro-1 appeared to have replaced the 9500 until the Pro-10 came along.Why Canon made a new inkset for the PRO-1/PRO-10 then ?
It is not uncommon - also for cameras - that they test new features on a consumer model first.