While there's been a lot of controversy over various Xbox One features, the good news is that gamers will be able to use a single Xbox Live Gold membership across multiple accounts in a household. A membership can also be supported across the Xbox One and the Xbox 360, which means that a single membership can be used across multiple consoles as well.
Microsoft's Phil Harrison says that "anybody who has usage privilege on that machine can use it," indicating that a Family Pack-style option could be making a comeback for the Xbox One. Microsoft discontinued the Xbox Live Gold Family Pack earlier this year, which came with multiple memberships at a slightly-discounted price.
For the Xbox One, it seems that a similar model will become available, although it's not exactly confirmed how the new model will work, but we do know that you won't need multiple memberships -- one for each person. Microsoft's Ben Kilgore says that Microsoft will still allow users to access their own friends list and such, saying that the company wants "you log in to get your stuff, and when he logs in to get his stuff. On that console, if you have Gold, he can use Gold as well."
As for current Xbox Live Gold memberships, those will be compatible with the Xbox One, so if you have an Xbox 360 now and end up getting an Xbox One, your current membership will transfer over, as well as still remain active on your Xbox 360, allowing you to go back and forth between the two consoles.
Again, we're not sure exactly how this model will work, but so far it sounds a lot better than the current Xbox Live membership model on the Xbox 360. We're also not sure if Microsoft will change up the pricing structure for memberships, or if they'll introduce a new tier system, but we should be hearing more about that later this year.