Here's a shot of it u/c back in August, much more progress since.
In the photo, you can see just how large scale they're making this one with 4 tracks for DARTs new Yellow Line (w/branch) and 2 tracks for the already existing special events stop on the DART/FWTA Trinity Railway Express.
Dallas Cowboys Stadium early renderings
Location either Center City Dallas or the Las Colinas Urban District Irving.
Price tag up to one billion USD. Source
...a domed, air-conditioned, 75,000-seat facility with a retractable roof and open end zones linked to fan decks that could increase seating capacity to 100,000 with reduced-cost tickets.
The Cowboys Hotel
Hotel & Conference Center
The Legends Square
The Cowboys Experience
Interactive Sports Entertainment
The Cowboys Fields
Public-Use Sportsfield Complex
DART Yellow Line at the other end, comprehensive planning in progress:
(specific link lost - will retrieve later)
go to http://dart.org
, plenty of comprehensive plans to view - look for NW Corridor on the site.