Microsoft have just announced at the Windows Phone 8 launch event that that the Windows Phone 8 SDK will be available to the public starting tomorrow. It will be announced at the BUILD event, where we assume they will talk and give an insight on some of it's new features.
Developers have been waiting for the SDK for Windows Phone 8 ever since Windows Phone 8 was announced earlier this year. The blow came when Microsoft announced the SDK wasn't coming out to the public, and instead would be available to a few selected developers.
Now, starting tomorrow everyone will be able to download the SDK for free! This will allow you to develop apps for Windows Phone 8 (and we assume 7.8 too).
Tune into BUILD tomorrow for the full details.