Why would Apple create monitors just to fit with Mac Pro ? A relatively large percentage of Mac Pro users build systems with 3rd party monitors. If it is a picture of what a customer set up then a 3rd party monitor is just as likely.
While they could that takes dribbling out info to a goofy extreme. The pricing is still incomplete on the BTO options and the monitor is in the black also. The primary target of the TB docking station/monitor is the laptops anyway. Those are all out at this point.
They appear to have nuked the 27" Display/Docking station with displayPort connectors at this point though. Kind of "odd" to kill off the 'old' product without introducing at all the new one.