You’ll be able to use your gamertag on an Xbox One and an Xbox 360 at the same timeby Steve Wright 3 September 2013
As part of IGN’s latest “Ask Microsoft Anything About Xbox One,” Chief Xbox One Platform Architect Marc Whitten confirmed that gamers will be able to simultaneously log into an Xbox 360 and an Xbox One.
“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,” Whitten confirmed with IGN. “However, like today, you can only be signed into one Xbox 360 and one Xbox One at a time.”
We assume the real talent required here is being able to play both the current-gen and next-gen consoles at once.
The Xbox One will be available in late November in Australia and New Zealand.