Well, the exceptional thing about the HPs is really the ink, rather than the printer itself. The ink is super-long-lived on every medium, not just a few where Canon's Lucia EX matches it, and, for most purposes, has decent gamut and Dmax.
Sure, the printer itself is very nice in some ways (cheap, easily-changed heads and other parts, inbuilt spectro), not so great in others (handling of ultra-thick media), but, really, those are secondary to the inks. If push came to shove, I'd be just as happy running the inks through a Canon printer (would probably draw the line at Epson's clog-prone, no-backup-nozzle head though).
If they do come out with a new printer and line of inks, I can only hope that they're just as lightfast, if not more so, and sacrifice none of their longevity in order to boost their short-term saturation. Heavier pigment load or extra colours for greater Dmax and gamut would be very nice, but not if it comes at the expense of longevity. After all, if that's what you're after, Epson's already offering it in spades.