Try GDR 3 / Update 3 Developer Preview for Nokia Lumia Windows Phone 8

If you brave enough and want to try Pre-Release GDR 3 / Update 3 Developer Preview for your Nokia Lumia with Windows Phone 8, yes you can try from today.

To participate, you must pass some requirements and once you updated to GDR 3 Preview, you can't go back to old version. But you can also receive update to the release state version once available later.

So, please read carefully all the terms, conditions and requirement before updating.

Requirements

You must have "Phone developer unlocked" OR "Windows Phone Store Developer" OR Windows Phone App Studio Developer Account.

Note from nokianesia: The easiest and fastest way is you just register at apps.windowsstore.com with your Microsoft Account, that's all. (click "Start Building" on the page and then login with your MSFT ID, Done). - FREE of Charge

Minimal OS Version: 8.0.10322.71 or GDR 2 (Check at setting > about > OS Version)

Special Note

Updates will only include the Microsoft update, and not additional OEM drivers/firmware i.e. this is not Nokia’s ‘Bittersweet shimmer’; users should remain with their current firmware and will not lose it
You will continue to receive the official update (and firmware) when they become publicly available, so there is no missing out of features, nor will you ever be behind
You CANNOT REVERT to a prior OS version once you have taken an update via this program
This may / will void your device warranty
Do it With Your Own Risk
Source: Symbian Tweet

How To Install

Download & Install "Preview for Developers" App from Windows Phone Store
Open "Preview for Developers" App
Follow all the steps, validate and login with your developer ID (your registered Microsoft ID at apps.windowsstore.com)