The new Terminal C opened at Orlando Airport a couple of months back. Here is the information page on it:
www.orlandoairports.net
Note that the Brightline Station appears in the schematic diagram it has an entire section in the description of the complex.
The diagram even shows the space that is left open for the SunRail Station to the right of the Brightline Station.
At present one has to walk through the Parking Lot C structure to get from the Airport Building to the Train Station. Eventually there will be a direct walkway connecting the two adjacent to the Parking structure.

Terminal C - Orlando International Airport (MCO)
South Terminal Complex Layout The South Terminal Complex comprises the following facilities: Train Station TRAIN STATION The Train Station consists of

Note that the Brightline Station appears in the schematic diagram it has an entire section in the description of the complex.
The diagram even shows the space that is left open for the SunRail Station to the right of the Brightline Station.
At present one has to walk through the Parking Lot C structure to get from the Airport Building to the Train Station. Eventually there will be a direct walkway connecting the two adjacent to the Parking structure.