I'm really looking forward to it too. 36,000 plants already planted, including 600 trees! Another interesting bit from one of the articles I read - they are using greenhouses at (around?) the old conservatory to grow plants for the Leaf.
And yes, it looks like the use of EFTE for roofs in snowy climates is a thing
https://www.wired.com/2016/09/vikings-stadium-roof/