What makes you think it's going to be a significant upgrade? Any chance they will do a quiet upgrade over summer or is it fall sometime?
One reason is because we are due a redesign either this year or next year. Although that might not happen this year, what is likely to happen is the move to DDR4 RAM while the use of USB-C and Thunderbolt 3 ports along with the upgrade to the 400-series graphics is almost guaranteed.
400-series graphics will be the biggest upgrade in the last few refreshes since the current 300-series is just a rebrand of the 200-series so not really an upgrade. The 400-series is a whole new card using a new architecture which has proven to be a significant step and will reduce the graphical issues present due to having to drive the 5K display.
If there is no redesign, the central point of interest will be the improved graphics as there will be no CPU upgrade unless they wait until March. Smaller features such as Truetone may also be present.
If there is no redesign, it is possible that it will be a quiet update and looks to be this Fall but it's Apple so they could wait longer for the new Intel processors early next year.
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Yes it's true. I did get bit once with an update coming a couple of weeks after I purchased so I'm just considering my options. I'm leaning towards buying now ask can get the Beats headphones thrown in for free. I doubt that deal will exist by the time the iMac is announced.
The deal won't be present so I guess it's choosing between better specs or Beats headphones. I would personally choose the better specs although if the free headphones will be of more use and importance to you then I guess it might be best to take advantage of the deal.