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Not yet it seems. They haven't released an update to their Thunderbolt Display in years (since 2011), but it should be right around the corner with the release of this 5K iMac.

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They would have announced it today if that was the case. Currently there isn't a display transport capable of pushing that many pixels. DispayPort 1.2 can't do it on a single port and that's what Apple has MacBooks and Mac Pro.

Don’t both MacBook Pro and Mac Pro have multiple Thunderbolt ports? Don’t those work as separate DisplayPorts? At least on the Mac Pro?

Yes, and that's already being used by the first batch of 4K monitors and is called MST. This models the monitor as 2 lower-resolution displays and drives them with two separate signals.

It has a lot of compatibility problems, and is hacky as hell. I doubt Apple would adopt this as an official/first-class solution to anything.

Exactly. They can get away with it in the iMac 5K because it's all baked into one tight enclosure.

> It has a lot of compatibility problems

Solving "compatibility problems" is what Apple do best by requiring you have an Apple Mac Pro and an Apple Cinema Display and not supporting any other configuration

they only have 1 bus

The Mac Pro has two buses, but the Macbook Pro has only one – so the fact that there are two Thunderbolt ports doesn't really help you in this case.

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