Aqua-Soft ForumsI'm installing this as we speak, and from what I've read it's a major update to the last Panther available (including the online update).
Quotes:
This release reflects extensive engineering efforts since the WWDC, with issues addressed in almost every component of the OS," the Panther seed notes read. However, according to the read me, each specific bug was not listed because of "the extent of the bug fixes."
A new version of Xcode Suite was also seeded, with "issues addressed in almost every component," according to the read me. "While not all feedback and bug reports have been addressed in this release version, we appreciate all your input and value it highly," Apple told developers. "Apple engineering welcomes your feedback and input on all aspects of the Xcode Suite. We are particularly interested to receive feedback on Xcode workflow issues and the 'Fix and Continue' feature."
What's new:
- Updated developer tools (new XCode)
- Many speed optimizations
- Bug fixes to almost every part of the OS (Apple said to many to list!)
- Updates to Mail and Expose
- New Java runtime
- Brushed AND Aqua Finder modes!!
- Safari 1.1!!
Screenshot of new Mail Preferences:
A pile of other screenshots:
http://forums.appleinsider.com/showthread....40&pagenumber=2
Personally I found the last build pretty stable, I read somewhere that this release contains Safari 1.1, but I guess I'll just have to wait another 5 mintues for it to finish installing to find out.
[Edit]
w00t w00t! Yes Safari 1.1 is included 
[/Edit]
