Stadium Series? Winter Classic?

"Stadium Series" and "Winter Classic" are likely trademarked. So EA would need to put out some kind of generic 'Outdoor Series' in generic stadiums. The purists would lose their minds. 

You could probably add a couple generic football / baseball stadiums, though…. They’d make excellent epic arenas, and could be used in WC. 

Hey there. This is mainly a licensing issue. Without access to all of the branding for the mode, it would probably not be well received. We're definitely aware of the requests for the Winter Classic. Hopefully, it can be added in a future game.