http://www.macrumors.com/2009/03/25/marble-interface-to-be-revealed-in-next-snow-leopard-seed/

AppleInsider claims that Apple will be revealing a major user interface overhaul in the next developer build of Snow Leopard.

All developer seeds to date have carried the same general user interface elements from the current version of Mac OS X Leopard. In January we reported that Apple was working on a unified user interface codenamed "Marble":

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Based on our sources, however, Apple will apparently use Snow Leopard's release to tweak the overall user interface for Mac OS X and unify it across applications. Exact details of the theme changes have not been made public, as the current developer seeds for Snow Leopard still retain Apple's existing Aqua theme. The new theme will likely involve tweaks to the existing design and perhaps a "flattening" of Aqua in-line with Apple's iTunes and iPhoto interface elements.