Preview at WWDC likely in June, followed by September launch.
Mac OS X Snow Leopard Build 10A432 Designated 'Golden Master'?
Several knowledgeable sources (Do not mess with it) believe that Snow Leopard (10A432) have finally reached the stage of Golden Master. Clearly, unless a blocking problem is the version currently distributed internally to serve as a basis for pressing DVD.Commenters on the Mac4Ever report note the recent appearance of several benchmarks for Build 10A432 appearing in the Geekbench database, although the entries have since been removed.
Google search result showing Geekbench entry for Build 10A432
Mac OS X Snow Leopard is slated for a September release and will be priced at $29 for current OS X Leopard owners. Users purchasing a new Mac on June 8th, 2009 or later can receive the updated operating system for $9.95 though Apple's "Up to Date" program.
Update: We've heard additional confirmation that 10A432 is likely the Golden Master build.