Apple has released another build of the upcoming 10.5.7 operating system, which builds on the existing Leopard iteration, to developers and many people are whispering that a release is coming very, very soon. The news comes from AppleInsider, who states that developers have been getting weekly betas for nearly two months, the most recent of which being late Tuesday. There are a few signs that the release is coming soon, one of which being extremely frequent builds that only fix one or two issues at a time. This is a sign they're just hunting and killing minor bugs as they find them, and that development is closing up.
Mac OS X 10.5.7 brings with it 108 documented code corrections, and is currently in it's seventh week of testing. It will bring with it updates to 20 of the core OS X components, such as iCal, MobileMe syncing, networking and Time Machine, as well as bringing an updated speech dictionary. There has been another indication that it is arriving soon, and that is that iMacs equipped with ATI Radeon HD 4850 are shipping very shortly, or in some cases have begun shipping. It was thought that these graphics card required the 10.5.7 update, but as AppleInsider mentioned, this isn't exactly confirmed.
The update is expected to hit around 443 megabytes, and it will be a delta one meaning there will be no operating system reinstall needed. There's no official release date yet, but if you've read the article, you should expect one very soon.