Update: Forza Motorsport 5 doesn't require a day one update to play after all

[ethomaz]

Thanks God this is not true and Forza devs explained.

"The player won't be blocked from playing the game" if they choose not to connect to Xbox LIVE, he continues, "but deeper areas in the career mode were designed to utilize these additional cars and tracks."

You need to download the addicional content to finish the carrer mode but you can play the offline content in the disc without need the downloaded content.

http://www.videogamer.com/xboxone/forza_motorsport_5/news/forza_motorsport_5_doesnt_require_a_day_one_update_to_play_after_all.html