What happened: The Kansas City Chiefs are developing an enclosed version of Arrowhead featuring a translucent roof, scheduled to open in 2031. The new $3 billion venue will seat 70,000 fans.

Why it matters: The climate-controlled facility aims to modernize the franchise's home environment while protecting attendees from extreme weather. The design retains elements of its historic predecessor.

What to watch: The franchise will provide further construction updates ahead of the planned 2031 opening.