Rezumat Ask Microsoft Anything About Xbox One - IGN:
You’ll be able to be signed on with the same gamertag on both an Xbox 360 and an Xbox One console at the same time. However, like today, you can only be signed into one Xbox 360 and one Xbox One at a time.
We will not carry over any of the 360 reputation scores into the new Xbox One reputation system. The majority of members will start fresh at the “Good” player level.
Xbox One isn’t a native Media Center Extender. We’ll continue to work to enable more ways for everyone to get the television they want over the life of the program.
The Kinect cable is 3 meters long.
Will digitally downloaded games be able to be pre-loaded before release, so that they're simply unlocked and ready to go at 12:01am on the day of release?
MARC WHITTEN, CHIEF XBOX ONE PLATFORM ARCHITECT: Not at launch, but you’ll see us do this and much more over the life of the program.
Microsoft required Xbox Live Arcade games to have a demo, making it easy to test out these titles before buying. Now that "games are games are games" what can we expect from demos on Xbox One?
 WHITTEN: Not all games will have demos like Xbox Live arcade games have had on Xbox 360. That said, we are going to work on lots of ways to make it easy for you to find and try new games on the service.
Will I be able to get pre-order bonuses and special edition versions on digitally downloaded games?
WHITTEN: Yes! You’ll see more details here in the future.
Will the Kinect sync to your voice? Let's say your friends want to mess with you by saying" Xbox Off." Will we be able to make it only respond to our voice?
WHITTEN: We are focused on ensuring that we have great voice support which includes understanding which person is speaking in the room. Additionally, for actions that are potentially destructive, we have a confirmation dialog which will be the case for “Xbox Off.”
With the upgraded audio codec for chat, is 8 people still the maximum for Party Chat?
WHITTEN: We are looking at higher limits on party size. It will be at least 8 people chatting at a time. We may either increase the number of people that can be chatting at once or potentially allow more people in the party channel if only a smaller number is chatting. Stay tuned!
Do I need to download demos, or can I stream them?
WHITTEN: Just like regular games, Xbox One allows you to start playing while the game continues to download.
Will we be able to have longer gamertag names?
WHITTEN: No, we are staying with our current naming scheme for Xbox LIVE gamertags.
Can you organize your now-expanded Friends List into categories? i.e. “College buddies,” “Friends from work,” etc.
 WHITTEN: You’ll see us add more in this area in the future. At launch, you’ll have your expanded list of friends and the ability to mark favorites so that it is fast and easy to play with the friends you care about most.
Is there cross-console Party Chat? i.e. since it’s all “Xbox Live,” can people on Xbox 360s Party Chat with their friends on Xbox One?
WHITTEN: For a variety of technical reasons – including the sound quality that I talk about below – we don’t support voice chat between the two systems. You will still be able to send and receive text messages to friends on both systems, however.
Are Xbox 360 Avatars transferring over? If so will any changes be made to them?
WHITTEN: They are – your avatar will be on the system at launch and in fact, you’ll have some new options, including the ability to do full-body HD gamerpics. By the way, we should actually talk more about gamerpics too. We’ve moved from the 64x64 gamerpics on Xbox 360 to a full 1080p. They are beautiful, and you are going to see some really cool hero moments, like when you login to see personalized views of your games and other content.
Will the Game DVR capture at the source resolution? i.e. will Forza 5 clips capture at 1080p and 60fps? And where can Game DVR clips be uploaded to?
WHITTEN: Game DVR captures beautiful clips at 720p 30fps. The first thing you’ll see with our game DVR is the integration of our Upload service on the console. This service allows you to manage, edit, and share your content. Your clips are stored in the cloud. Also, you’ll see games making “magic moment” videos of your gameplay based on the game DVR functionality – all seamlessly integrated. You’ll be able to see these clips in the Xbox One Guide, in your own game DVR collection, and when you are looking at gamercards on the system. You’ll also see games take advantage of this platform capability and do interesting things to integrate captured game footage into the game experience itself.
Can you earn two sets of Achievements for the same game (i.e. Playing Call of Duty Ghosts on Xbox 360 and on Xbox One)?
WHITTEN: Every game has its own set of achievements, so if you’re playing Call of Duty: Ghosts on Xbox 360 and on Xbox One, you can earn a separate set of Gamerscore in each game. But on the Xbox One version, you’re getting a much richer set of features, such as seeing your achievements progress on the Xbox One console, being able to unlock new achievements throughout the year, and earning real prizes inside and outside of the game. Xbox One also enables a new concept of challenges, where games will be offering special time-based opportunities to earn various goals and collect the rewards. More info on challenges can be found on Major Nelson's blog here.