There isn't much more to say about these Mac OS X seeds, except that Apple is still at it. Tonight, Apple delivered Mac OS X 10.6.3 Build 10D561 for developers. iPhone Canada details the changes listed, which haven't changed much since the previous build.
Given the rapid release sequence to the seeds, we still expect Apple to be releasing 10.6.3 to end users shortly. 10.6.3 is primarily a bug-fix/performance release, with the only new features reported being some increased adoption of OpenGL 3.0 - a programming interface for 3D graphics.