Depends on what they add to it. And the price. If they add a better rear camera and lower to $199 for the base model, I'm there. If they keep the camera and price as is, no deal; I'll stick with my 2G iPT.
A recent rumor pointed to next year's iPT being a major redesign, so I might hold off for that... just hope it isn't some chumped out revision like the Nano last year.
My purchase will also depend on the iPhone revision. There are tepid rumors of a cheaper iPhone revision. So it also depends on the price and function of the possible low-end iPhone.