The iMac just had a major refresh. Which means all it will have is spec jumps for the next few years. There is no point in waiting as there will always be a faster one coming.
5g wifi seems worth waiting for.
"Apple Insider" wrote this in January 2013:
"People familiar with the deal indicated to The Next Web that the forthcoming industry standard for Wi-Fi will appear in Apple's lineup this year. The so-called "5G Wi-Fi" offers up to 1.3Gbps data with a three-antenna design.
That's the dream I am holding on to anyway...lol