Good news , for the users as crazy as I am, V1.3 of APS prints on any width with a minimum of 30 or so CM of length. Actually A4 is 21x29.7 cm so it is a little shorter. Works fine and will print the Tc 9.18 chart in 5 pages. Now it's not that practical as each page has to be loaded and the spectro calibrated, but it is nice that HP listened and made XRite add even the smallest of pages. Okay not for mini printers, dye sub 4x6 etc but for inkjets this is great.
BTW I just noticed you can calibrate the loaded media directly in APS without returning to Print Center. On top, APS will not profile an uncalibrated paper, so again clear forward thinking to ensure an optimal sure result.