I think your guessmate is pretty good here. The i3 and i7 SP3 was just rolled out on August 1st. You have to think it's really unlikely Microsoft would release an updated machine this year. Waiting for the next gen processor is really a zero-sum game. While broadwell will give the SP a nice performance bump everything else will get a similar bump so it won't move up the chart.
And then people will still find something to be unhappy with.