Link below to an interesting article on stadium design for the future, although it's more about upcoming projects, such as the new Spurs one. I must say I love the idea of their Kop-like stand. Oh well.
https://www.theguardian.com/sport/2017/jun/15/stadiums-future-holograms-drones-fan-experience
You'll also find links in the article to Chelsea's new ground, which I also quite like - https://www.theguardian.com/artanddesign/architecture-design-blog/2015/jul/03/chelseas-new-stadium-inspired-medieval-village-beyond-ugliness-roman-abramovich
and Bordeaux's new-ish ground, which is more traditional - http://www.archdaily.com/633554/the-new-bordeaux-stadium-herzog-and-de-meuron
Feel free to add to the collection of new grounds.