Microsoft just released a press release announcing that Windows 8 has been released to manufacturing (RTM)

Here are the important dates for us developers

August 15th: Developers will be able to download the final version of Windows 8 via your MSDN subscriptions.

August 15th: IT professionals testing Windows 8 in organizations will be able to access the final version of Windows 8 through your TechNet subscriptions.

August 16th: Customers with existing Microsoft Software Assurance for Windows will be able to download Windows 8 Enterprise edition through the Volume License Service Center (VLSC), allowing you to test, pilot and begin adopting Windows 8 Enterprise within your organization.

August 16th: Microsoft Partner Network members will have access to Windows 8.

August 20th: Microsoft Action Pack Providers (MAPS) receive access to Windows 8.

September 1st: Volume License customers without Software Assurance will be able to purchase Windows 8 through Microsoft Volume License Resellers.

As you can see, you only need to wait 15 days before you can download Windows 8 RTM from MSDN

Rest of the press release can be found here:

Windows Server 2012 is also released, see here for more info:

September 4 is when Windows Server 2012 will be generally available for evaluation and purchase by all customers around the world

Visual Studio 2012 is also done, see here for more info:

For MSDN Subscribers, the bits will be available for download on August 15th