In the HP range, the B9180 is new. Epson may just have something new up their sleeve waiting to launch, but at the moment I can't anything dramatic being imminent, especially as they've just released another Ultrachrome K3 printer in the 3800. The Canon Pro 9500, which is the pigment printer somewhat comparable to the dye Pro 9000 that Vincent reviewed recently, sits in the wings waiting to make its appearance, but looks, if anything, as if it may be more expensive than the Epson R2400 and HP B9180 (though we must bear in mind that all we have this far are a few RRP figures, which don't mean much).
Whilst there's always scope for improvements, things have got so good already that future improvements may well be rather small.
If you want pigments, the Epson R800 and R1800 are worth a look, particularly if it's glossy prints you're interested in. However, the B9180 is an excellent machine, and certainly in the UK it's a little cheaper than the Epson R2400. When you take account of the ink included in the B9180 (as I mentioned here
, which I presume is the thread you're referring to), about half the price difference between the B8350 and B9180 in the UK is accounted for by the extra ink you get with a B9180.
In other words, if you want a B9180, I'd buy one. Even if you think your efforts don't justify such a printer yet, you know that your prints should last - and you may be very grateful for that in the years to come.
One final consideration is that if you don't already have a screen calibration and profiling setup, you may like to consider the B9180gp bundle. I believe I'm right in saying that the included system is a HP branded Gretag Macbeth Eye One Display 2, at a considerable discount over buying that product separately.