BabyGotMac.com details some features that will accompany the already huge upcoming update to Mac OS X Leopard.

The ability to share a DVD/CD with the MacBook Air has been added to Mac OS X 10.5.2.

Ability to share DVD/CD’s to MacBook Air

Time Machine can reportedly use a disk connected to an Airport Extreme base station for backups, Time Machine now has a dedicated drop down menubar and once again has the ability to backup to network drives.

Time Machine can now backup to a remote network drive
Time Machine has its own dedicated menubar drop-downTime Machine has its own dedicated menubar drop-down
Time Machine can now use external drives connected to Airport Extreme base stations for backupsTime Machine can now use external drives connected to Airport Extreme base stations for backups

Under Desktop preferences the menubar can either be translucent or not.

Ability to adjust appearnce of menubar has been addedAbility to adjust appearnce of menubar has been added

MacRumors writes that a new build has been released to developers today (seed 9C20) and lists no known issues. Graphics driver updates have also reportedly been separated from the OS X 10.5.2 update.

MacRumors notes of unconfirmed reports that Apple is aiming for a public release of Mac OS X 10.5.2 this coming Friday.