The Apple Store writes:
Add a new Mac to your Mac. Mac OS X v10.5 Leopard is packed with over 300 new features, installs easily, and works with the software and accessories you already have.
Choose a single-user license for home or office. Or if you have more than one Mac at home, choose the five-user Family Pack.
The single user license costs $129.00 and the family pack license costs $199.00
Whats in the Box
DVD containing Mac OS X v10.5 Leopard
Printed and electronic documentation
Minimum System Requirements
Mac computer with an Intel, PowerPC G5, or PowerPC G4 (867MHz or faster) processor
512MB of physical RAM
DVD drive for installation
The OS is said to be delivered on October 26.