The Maracanã Stadium will not be part of Data Pack 1, Konami has confirmed.
DP1 - set to be released on October 29th - will implement the game's first transfer update for all offline modes. Also confirmed, DP1 will provide users with seven additional UEFA clubs, new boots, a match ball, and more player faces - Liverpool's Jordan Ibe and Milan's Alessio Romagnoli have already been confirmed.
Exclusive to PS4 and Xbox One, the world-famous Maracanã - home ground of both Flamengo and Fluminense - will launch next month (presumably via Data Pack 2).
Interestingly, this video shows that the stadium will have its own exterior view intro before each match. Perhaps a sign of things to come for the future?