Apple has reportedly [1] seeded a new build of Tiger to developers this week.
The new build, labelled "8P2122" has three known issues including stability issues with Wacom v600-3 drivers, iMovie and Entourage. Meanwhile, Apple itemizes a number of bug fixes with OpenGL, USB, File Manager, CoreAudio and CoreImage.
It weights 164MB and 70.3MB, respectively for the Intel and PowerPC versions.
The last build, "8P2120", was seeded [2] just last week. At current rate of seeds, we may expect the release of this update for the next few days.