Today, I was able to receive 2 updates. First is a minor update in preparation for the Windows Phone 8.1 update. And then got the second one for the DEV(windows phone 8.1) update.
For those who can't w8 for the update. You can sign yourself as developers and get your own update. Goodluck
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I have here step on how to become a developer.
How to get Windows Phone 8.1 Preview?
1. Open App Studio: http://appstudio.windowsphone.com
2. Sign in with the same Microsoft account you used on your Windows Phone.
3. Install Preview for Developers app on your phone: http://www.windowsphone.com/s?appid=178ac8a1-6519-4a0b-960c-038393741e96
4. Sign in with the same Microsoft account used above for step 2.
5. Tick the Enable Preview for Developers box and tap on Done.
Check the OS version in Settings > About, it must be 8.0.10521.155 before installing the WP 8.1 Preview. If your OS version is less than 10521 you will first get this update after enabling Preview for Developers.
You can get Cortana by changing the Region to United States in Settings > Language+Region. You can do this before or after the update, it doesn't matter as Cortana will get installed on the phone as part of the WP 8.1 Preview update.
Terms and Conditions: http://dev.windowsphone.com/en-us/featured/devpreview
The download size will be around 500 MB and you must have at least 1 GB free space on Phone Memory.
Windows Phone 8.1 Preview will be released on April 14, but the time is not known.
Join this event: www.facebook.com/events/271944926314391
You will get a notification on Faceboook when the Preview is released.