We just announced that Windows Phone 8 Update 3 is coming. The full feature list is in the post, but in summary:
At the bottom of the Windows Phone 8 Update announcement, there’s a very exciting announcement for Windows Phone developers, we’ve also announced a Preview Program for developers.
In summary, if you have a developer-unlocked phone you will be able to install the update early. You need to visit the Windows Phone Preview for Developers page. This page goes through everything you need to know about the preview program. Once you accept the terms and conditions, you can download the Windows Phone Preview for Developers app, which installs from the Windows Phone Store directly onto your phone and allows you to opt your phone in to receive updates. Then you can head over to your phone’s Phone update setting app and get your update on.