If you don't feel like spending $19, head on over to App Studio and register.
Here's how it will work.
Visit the Windows Phone Preview for Developers web site (this will become live later today) and accept the terms and conditions. Then, download the Windows Phone Preview for Developers app, which installs from the Windows Phone Store directly onto your phone over the air. This app lets you opt-in new updates directly from your phone. Then, simply visit Phone Update in Settings and check for updates. Voila!

[warn]Warning: Microsoft notes that the version of Update 3 you download this way will only include Microsoft's code, and not the handset maker and carrier firmware, driver and other software updates that will be added to the public release. You need at least OS version 8.0.10322.71 to participate and you can only move forward with regards to updates: There's no going back. Furthermore, it's possible this update will void your wireless carrier warranty.[/warn]
Source: http://winsupersite.com/windows-phone/windows-phone-8-update-3-preview
More info: http://www.windowscentral.com/get-gdr3-today-windows-phone-preview-developers
Here's how it will work.
Visit the Windows Phone Preview for Developers web site (this will become live later today) and accept the terms and conditions. Then, download the Windows Phone Preview for Developers app, which installs from the Windows Phone Store directly onto your phone over the air. This app lets you opt-in new updates directly from your phone. Then, simply visit Phone Update in Settings and check for updates. Voila!

[warn]Warning: Microsoft notes that the version of Update 3 you download this way will only include Microsoft's code, and not the handset maker and carrier firmware, driver and other software updates that will be added to the public release. You need at least OS version 8.0.10322.71 to participate and you can only move forward with regards to updates: There's no going back. Furthermore, it's possible this update will void your wireless carrier warranty.[/warn]
Source: http://winsupersite.com/windows-phone/windows-phone-8-update-3-preview
More info: http://www.windowscentral.com/get-gdr3-today-windows-phone-preview-developers
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