http://www.macrumors.com/2008/06/10/snow-leopard-seeded-to-wwdc-developers/
Apple has seeded WWDC developers with an early release of Mac OS X 10.6 'Snow Leopard' today. A photo of the installation disc was posted to MacNotes.de. Meanwhile, a site called OrchardSpy claims to have posted screenshots from the actual installation and reveals a build number of 10A96: