While launching last week, the firmware has only launched on two to three million consoles to date.
From today (October 23) an additional eight million systems receive the update worldwide.
"It'll start rolling out [from October 23] more-so globally," Xbox Live product manager Pav Bhardwaj told Digital Spy.
"Then usually we say about a week, so by the end of this week most people will have it. We just do it in batches and to make sure it rolls out smoothly."
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The update refreshes the 'Metro' branded interface with a tweaked layout of tiles, combines the TV and Movies channels, and in the US, introduces a sports channel.
Internet Explorer will be added for Xbox Live Gold subscribers, allowing users to browse the web with a controller or Kinect.
Searching is now expanded to genre, while voice search now includes YouTube, and is available to new countries including Ireland, Canada, France, Germany, Japan, Mexico, Italy, Spain and Austria.
Favourite content can be pinned to the dashboard, allowing fast access to games, TV shows, music, videos and websites.
Similarly, Quick Play will be rebranded as Recent, providing a list of games, movies and apps last used on the console.
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Zune Video Marketplace is to be rebranded as Xbox Video, offering hundreds of thousands of TV shows and movies available for purchase or renting.
The recently announced Xbox Music will also be made available today.
The update introduces Xbox SmartGlass, which will be made available when Windows 8 launches on October 26.
Picture gallery: View images of the upcoming Halo 4 console bundle below:
Copyright: Microsoft Games