Xbox Live will be unavailable on June 27th from 02:00 ’til 06:00 PDT, according to the official PlayOnline site. Major Nelson is MIA at the moment and by the looks of it there’s no official word from Microsoft so we’ll just have to wait until the Major gets back from his trip to Cali. Hopefully this update has something to do with the release of Street Fighter II, a man can only hope…
Update: The Major confirmed it.

At the following time Microsoft will be performing maintenance on the Xbox Live service.

For more information please see the Xbox Live official homepage (http://www.xbox.com/live).

The PlayOnline Viewer will be unavailable to Xbox 360 users during this time. Players already logged into Playonline will be able to continue to use PlayOnline services. However once logged out, PlayOnline will not be accessible until the maintenance period is over.

We apologize for the inconvenience.

[Date&Time]
Jun. 27, 2:00 to 6:00 (PDT)

[Affected Services]
Users of the Xbox 360 edition of the PlayOnline Viewer

We’ll notify you when we receive an official word from Microsoft but it looks very plausible.

Update: Major Nelson confirmed it:

On Tuesday June 27th from 0200-0600 PT Xbox Live will be offline for maintenance. As a result, the ‘My Xbox’ section of Xbox.com will be unavailable, and the Xbox forums will be in read only mode (you won’t be able to post.) The remainder of Xbox.com will be available.

Click this link to find out what time the maintenance will begin in your time zone

This is for maintenance, there are no new features that will appear when the service comes back online. This is all for server maintenance…nothing more, nothing less.

Thanks for submitting YLA G!