Some new details about the stadium proposal are in this article:
https://talksport.com/nfl/3604811/new-chicago-bears-stadium-arlington-heights-plans-update/
Including some information about how the AH design has been modified from the Lakefront proposal.
"According to Manica's president and owner, David Manica, the move to Arlington Heights allowed a redesign that will see visitors access the stadium from all different angles, which was an issue with the downtown location, adjacent to Soldier Field."
“When we changed sites, there was some redesign required, primarily having to do with access to the building and the site,” Manica said.
“The building is going to flow more smoothly and efficiently now, people will be able to get into the building now from different angles.”
Facing southeast, the new stadium will capture views of downtown Chicago in the distance, as well as the development in the foreground.
The 326-acre Arlington Heights site has also allowed for large glass windows on both the east and west sides of the building. Only one side had windows in the downtown plans.
According to a report from Sport Business Journal, the east window measures 235ft wide at the base, 200ft wide at the top, and has a height of 125ft. The west window is 240ft wide at base, 185ft wide at the top and 85ft tall.
“The biggest changes were really what happens outside the building now,” Manica added.
"We had a lot more breathing room and elbow room, so it’s more gracious in terms of the surroundings, the secure perimeter, VIP parking -- all those things we could incorporate into the project.”
What does the new Chicago Bears stadium look like inside?
New renderings of the proposed building confirm the shape of the seating bowl and its proximity to the field, as well as plans to include a unique concourse pedestrian bridge in one end zone, which is a nod to Chicago’s architecture.
Manica added that compared to Soldier Field, the level of comfort will be huge, with 'wider seats and more legroom, but also more concourse area, more toilets, and more circulation space'.
Similar to other stadiums the firm have designed in recent years, the Bears’ Arlington Park venue will feature an Ethylene-Tetra-Fluoro-Ethylene (ETFE) roof, which is a lightweight, durable, and highly transparent alternative to glass.
"It also allows controlled sunlight in," Manica explained.
"You can get a nice daylight atmosphere without having harsh shadows on the field, so it gives us a lot of light control.
“We specifically asked the Bears about that and that’s one thing they wanted to carry forward.”