Depends if you really need the extra processing power...
"Another good thing Graff revealed is the upcoming 5th Generation Intel Broadwell processor, featuring a 14 nanometer manufacturing process and Intel Iris Pro graphics technology. Intel Broadwell will replace the 4th generation Haswell processors, and it expected to be introduced by later Q3 or Q4 of the year. The good thing is that this 5th generation Intel Broadwell processors are unlocked and hopefully will have good overclocking potential."
Coming out 3rd or 4th quarter of this year so... If you can wait that long
I don't think it pays to wait, besides better power consumption there probably isn't going to be much of a difference in computing power. But what are you running now? If you already have an i5 or AMD FX then you should be fine for the time being and might as well just wait.