Xbox One FAQ
 

Microsoft has put out a Xbox One FAQ this afternoon that will hopefully answer some of your unanswered questions. The good news? No "always on" connection required and it plays used games: Q: Does Xbox One require an "always on" Internet connection? A: No, it does not have to be always connected, but Xbox One does require a connection to the Internet. We're designing Xbox One to be your all-in-one entertainment system that is connected to the cloud and always ready. We are also designing it so you can play games and watch Blu-ray movies and live TV if you lose your connection. Q: Will Xbox One allow players to trade in, purchase and play pre-owned games? A: We are designing Xbox One to enable customers to trade in and resell games. We'll have more details to share later.

http://www.hardocp.com/news/2013/05/21/xbox_one_faq/