Apple has fixed some issues with Time Machine and AFP X Client and bumped Mac OS X 10.5.2 to build 9C30. The latest Mac OS X seed was released to developer's today, only four days behind 9C27. There are "no known issues" in this latest seed.
It seems clear that Apple is putting the finishing touches on Mac OS X, with accelerated developer releases in the hopes of reaching the final build. Due to the continuous bug fixing process, it impossible to predict the release date of the next update to Mac OS X. Historically, however, Apple has released the final build as quickly as one day following the last developer seed (9B18 seeded, 9B18 released).
