The ball's definitely in HP's court with regards to the Z9.
Is it going to be an artisan printer for photographers, individual artists and small studios, like the Z3200, or just another large-volume-production commercial machine like everything Epson produces, as well as most of Canon, and even the rest of HP's own lineup?
If they made an artisanal printer, with an emphasis on print longevity and having good B&W as well as colour output in the same printer, and features such as easily-replaceable printheads, inbuilt spectro and profiling, inbuilt cutters, ease of home maintenance, etc. - mostly already present in the Z3200 - they'd pretty much have the entire artisan market to themselves. And it's not a small market - it may sell less ink, but has the potential to sell more units, since more individuals would buy them, not just print shops. If it's just another commercial poster printer geared towards advertising output, with no particular features for the artisan market (even worse, if the old Z3200 does better with regards to key performance measures, such as longevity and monochrome output), then it becomes just anothrr printer competing against Epson and Canon for the same space, and even against HP's own latex printers, which do the same poster-printing job faster and more cheaply than aqueous printers anyway.