One week ago, we reported that Apple had seeded to developers a "Snow Leopard Graphics Update". While it was unclear exactly what the update is designed to address, a number of users have been complaining of graphics-related issues, particularly with high-performance games.
We have received word that Apple has seeded a new build of Snow Leopard Graphics Update to developers today, and while those familiar with the builds note that Apple has not documented any additional specific focus areas for testing, the one known issue in the previous build, which involved crashing of 3D applications on Mac Pros with the Nvidia Quadro FX 5600 graphics card, is no longer listed in the documentation as being present.
A public release date for the update remains unknown.