One thing that came to mind immediately is if the roof is rigid and fixed will it be transparent and how will they give the illusion of being outside, because the old fixed dome roof concept went the way of the dinosaurs.
Perhaps something along these lines
The NFL's First Translucent Roof Is a Super-Tough Monster
wired.com September 2 2016
When the Minnesota Vikings host the Green Bay Packers at the new US Bank Stadium in Minneapolis on September 18, it will be the first regular-season NFL game played under a roof made of a material called ETFE. The translucent plastic lets enough daylight in to bring an outdoor feel to the 66,200-seat building, but it also gives Vikings fans a fully indoor stadium.
Commonly used in everything from greenhouses and skylights to solar cells and groundbreaking architecture, Ethylene tetrafluoroethylene film is durable, translucent, and much lighter than glass, so engineers can use it to form roofs, windows, and facades with much less structural support. Its elasticity and strength allows designers to stretch the film across large expanses, like the Estadio Cuauhtémoc soccer stadium in Puebla, Mexico and the Allianz Arena soccer venue in Munich, Germany.
Sixty percent of the roof---240,000 square feet in total---is clad in translucent ETFE pillows, bathing the playing surface in natural light even on overcast days. Air supply units within the three-layer ETFE foil pillows maintain a minimum pressure. Held in place by an aluminum frame connected to the steel brackets of the roof, the triple layering helps control the thermal needs of the stadium.
If you've ever been to Minnesota, you'll know that snow is a very big deal. The Vikings' old home, the Metrodome, collapsed under the weight of accumulated snow from a storm in 2010. The ETFE roof was specifically designed to dispatch snow efficiently. Its outer ETFE foil is printed with a silver ink to create a glaze that deflects sunlight and melts snow. The pitch on the roof is also sharp, matching the Northern European strategy of encouraging snow to slide off. Architect Bryan Trubey of HKS also added a snow gutter, which lines the top of the stadium with a snow-melting system to further limit any concern of the snow's weight collapsing the roof.
Construction costs on a stadium with a 989-foot-long single-ridge truss would have ballooned if it had been made with steel and membrane. Trubey says shifting to ETFE not only cut costs and gave Minneapolis a unique motif, but it took the stadium's roof from what was projected to be one of the heaviest in the world for its size to one of the lightest.