I just thought with the release of a new Mac Pro they might update the mini display port model as I don't believe their newer version of the Mac Pro will support ThunderBolt (I could be wrong).
It is possible but ....
a. The current one is more oriented to being a docking station (i.e., the MagSafe) connector. If the product is primarily a docking station then Thunderbolt (TB) is a better solution. Three headed, fixed length cord is worse than a Two headed, fixed length cord.
The nominal use case for the product is probably pretty exhausted with all of the pre TB Macbooks , Minis , and iMacs already paired up with a display.
b. Even though it is a bit of a solution in search of a problem on the Mac Pro, Apple's tendency to OCD uniformity would make the Mac Pro match-up with the rest of the Mac line up by adding Thunderbolt. ( if they do add TB, any miniDisplayPort monitor you buy now will still work. )
If Apple were to jump back into the primarily being a display market they could do something like:
same panel. better/broad range backlighting solution , color coverage , no power supply for other devices. and useful for other machines (some buttons ). DisplayPort 1.2 support (or maybe even multiple inputs) .
don't hold your breath. buttonless , single input , and defacto proprietary solution is more the usually design track they follow.
It is way easier to go the path of the "happens to work with the Mac Pro" and have those users buy a docking station with an integrated LCD panel if wedded to matching logos between display and computer.