Sources reveal Apple's new-look interface for Mac OS X Lion's Finder, Mail, and other apps
New file view options in Finder, additional multi-touch gestures
According to the same people referenced above, a new view in Mac OS X 10.7 Lion's Finder will break down items in a folder by file type. Meanwhile, the Finder itself sports a new view called "All My Files," which works very much the same way for all of the files belonging to a user on a Mac's hard disk. The feature works like Cover Flow, in that you can scroll through rows with the mouse, trackpad or arrow keys when there are more documents or applications in the row that can fit inside the visible portion of the Finder window.
The new multi-touch gestures are designed to take advantage of the larger click TrackPads on more recent MacBook models, which could make them more difficult with older notebooks. Another strange quirk, people familiar with the developer preview said, is two-finger scrolling is reversed: to scroll down on a webpage in Safari, users must push up with their fingers, which is the opposite of how it works in Snow Leopard, but the same directly as scrolling on the iPad.