AppleInsider claims that Mac OS X 10.6 Snow Leopard will feature (among other things) a Finder re-written entirely in Cocoa. The Finder has remained Carbon-based for the entire history of Mac OS X so far, but the long journey from those frameworks towards Cocoa seems to be reaching its end for Apple's homegrown apps.
Test versions of the new Finder are being seeded to select developers in revisions of Snow Leopard with build numbers beginning with 10A. AppleInsider notes that seeds could be more broadly available to the developer community as early as tomorrow.
As Ars Technica noted in June, Apple apps will also apparently come "wrapped" in Cocoa. Further deprecation of some Carbon APIs seems likely as well, but it's unclear yet as to how Snow Leopard's support for Carbon apps will differ from plain-ol' Leopard's.
In addition to the Finder, improvements to support for Microsoft Exchange are expected for Mail, iCal, and Address Book. Also included is a new option for booting a Mac called ImageBoot. ImageBoot takes NetBoot a step further, allowing administrators to boot a workstation into Mac OS X directly from an image on a local disk.