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There's just not enough bandwidth over a single bus / single cable with DisplayPort 1.2. The iMac allows them to bypass that bottleneck and be one of the first(?) companies to ship a 5K display to consumers.

My predication is that once we see Apple deploy Thunderbolt 3 / DisplayPort 1.3, we'll see the Apple Cinema Display Retina.

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...which would mean L2013 Mac Pro users would be left out in the cold.

Yes, L2013 even uses the old Ivy Bridge-E Xeons and it's due for an update to the Haswell v3 Xeons (note that v3 Xeons use different socket, too, LGA-2011-3 vs LGA-2011 for the v2).

If I were in the market for the Mac Pro and could afford to postpone, I'd wait until the next update which should get the latest Xeon processors with the new socket and Thunderbolt 3 (which will be used for Broadwell Xeons).

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