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The Thunderbolt port can be used as video output, as it is backwards compatible with Mini DisplayPort.

To learn more about Thunderbolt (TB) and its compatibility with Mini DisplayPort (MDP):
And because Thunderbolt is based on DisplayPort technology, the video standard for high-resolution displays, any Mini DisplayPort display plugs right into the Thunderbolt port. To connect a DisplayPort, DVI, HDMI, or VGA display, just use an existing adapter.

To learn more about Mac OS X: Helpful Information for Any Mac User by GGJstudios
 
Knowledge. Thunderbolt and mini display are the same port.

Not completely true, Thunderbolt is backwards compatible with Mini DisplayPort, and will act as one. It doesn't work the other way around though.
 
Not completely true, Thunderbolt is backwards compatible with Mini DisplayPort, and will act as one. It doesn't work the other way around though.

Semantics. On the 2012 Minis, which he asked about, the single port provides both outputs.
 
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