Linked by Thom Holwerda on Fri 22nd Jun 2012 18:16 UTC
Apple "Why did Apple just release new MacBook Airs, MacBook Pros, and a Retina MacBook Pro, but no new iMacs or Mac Pros? And why are the iMacs probably being updated this year while the Mac Pro update won't happen for 12-18 months? As usual, I have some guesses." Good points.
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Other possibilities...
by bhtooefr on Fri 22nd Jun 2012 18:56 UTC
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Thunderbolt may only be 2 lanes per direction per port, at 10 Gbps per, but DisplayPort 1.2 can be 4 unidirectional lanes per port, at 5.4 Gbps per lane.

So, two DisplayPort 1.2 ports together can just do it, not using Thunderbolt at all.

And, what does the MBPR have? Two MiniDP/Thunderbolt ports. Wouldn't be surprised if they support DisplayPort 1.2.

Other thing is, there are display compression protocols - DisplayPort 1.3 supports panel self refresh, the beginning of such a protocol, and IBM was doing research on a standard for only doing updates over the video link (to allow cheaper video link hardware to drive their T221), which ended up being used as a low power video link (I can't recall the name of it (edit: DPVL, which actually inspired DisplayPort: ).

Edited 2012-06-22 19:07 UTC

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