The League has now also confirmed that the Winter Classic will be played between the Hawks and Blues at Busch Stadium in St Louis on January 2. The Penguins will also host the Flyers in a Stadium Series game at Heinz Field on February 18.
https://www.nhl.com/news/maple-leafs...es/c-279504926
Heinz Field will become the first stadium to host two NHL outdoor games in different seasons (Yankee Stadium hosted two within a week of each other in 2014).