Call it a strong rumor. One that many would like to see com true.

A leaked AT&T email to support personnel is indicating that AT&T will finally push out the Windows Phone 7 Nodo update on April 19th for the Quantum and Focus. The HTC Surround should receive the update in mid-May.

Quoting from the leaked email,

"Effective April 19, 2011, new Microsoft maintenance release updates will be available to AT&T customers with existing LG Quantum and Samsung Focus Windows Phone 7 devices. Approved updates for the HTC Surround are scheduled for availability in mid-May and will be communicated once approved."

The memo also indicates that this will involve the release of two new Maintenance Release updates (7008 and 73390). The 7390 update is being referred to as NoDo that adds copy/paste as well as additional functionality that is unique to AT&T.  There is no mention as to why the Surround's update is being delayed.

Sounds promising and fortunately it won't be long before we can tell if this rumor is a good one.  Oddly, the Microsoft Update page still shows AT&T's update as "Testing". Then again, Microsoft hasn't updated the update page since April 6th.  We'll keep you posted if we hear anything more on this.

Source: winrumors Thanks to everyone who tipped us on this!

Update: We just checked in on Microsoft's Windows Phone 7 Update Page and, as PugetChowder notes in the comments, it has been updated.  The Quantum and Focus are listed as "Scheduling" which typically means the update will be distributed within the next ten days.  The Surround update, unfortunately, is still listed as "Testing".