We'll have to see about the eco solvent, as it is still not very eco friendly compared to aqueous inks. But then again the UV cure stuff is still pretty bad. The thing with the UV cure is that you should be able to print onto anything without dot gain. The UV LED market has really helped to speed up the UV cure inkjet industry, and hopefully we'll see this in lesser expensive printers.
Everyone I've contacted that makes cure UV inks (and aqueous inkjet inks) has said that current Epson heads will die an early death if used with the current UV inks. The UV inks are also a much thicker (more viscous) ink, so the current Epson heads have difficulties with them. Most of the current UV cure printers use fairly large drop sizes, but if you cure as the head passes then there is little dot gain. These "high power" UV LEDs are allowing the light source to ride on the head for this immediate "cure", before this you had to run fiber optic cable to the head which is costly and bulky. Now when I say immediate cure, what I really mean is that the LED provides enough light to stick the ink to the paper, then the paper passes to a stronger light source for final curing. If the current Epson heads were able to use these UV cure inks, I would have built a printer with LEDs attached to the printhead for a project that I wanted to try. Dupont makes many different shades of ink from white to black, and just about every other color you might need (and were very helpful when I was looking into this about a year ago). Pretty much all of Dupont's UV cure inks are developed and manufactured in Europe where UV cure is fairly big compared to in the USA.