Today Microsoft released a new update for the Xbox 360. It is to help roll out the Fall update easier to everyone. So don’t expect a whole different experience. There are two additions to the Xbox, which are voice search for Australia and New Zealand. Other than that, there aren’t any other real changes.
The update is a mandatory update, so there’s no way to get passed it. You’ll get asked to update your Xbox 360 as soon as you sign in to Xbox LIVE. It won’t take too long to update, just a few minutes and then you’ll be signed back online.
Source: Major Nelson Blog