Apple has just released Mac OS X Lion Developer Preview 3 to registered developers via Software Update. The update is labeled as an update to Preview 2, but according to release notes, it's actually the third dev preview. We're currently in the process of gathering a list of changes, so stay tuned.
Changes:
- New options in System Preferences>Mission Control:

- There is a new animation when logging into the computer and displaying the desktop (seems buggy at this time)
- New Reminders menu in iCal
- New next desktop button in Dashboard space:

- New options when right-clicking (this appears to be buggy at this time):

- Compatibility to external displays has been improved (especially in Mission Control)
- There is now a Mission Control app
- Finder's toolbar has been slightly updated:
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- Desktop wallpapers have been updated (and new ones have been added);

- Reading List has been enabled in Safari:

- New changes in Mission Control: can add "desktops" right from Mission Control by clicking "+" button, close spaces from Mission Control, Mission Control no longer displaying text "Desktop 1" etc., when hovering over desktop thumbnails, magnification of thumbnails are seen




- Scrollbars now change color depending on the background (black background=light scrollbar and vice versa):
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- You can download all of Mac OS X Lion's wallpapers (including the new ones in this build) here:
http://www.mediafire.com/?hgeg2xhld19ryga - It seems as though Apple has added Nuance-based voices into Mac OS X. To use most of the voices in this menu (accessed in System Preferences>Speech), you must download them. Currently, trying to download the voices will result in an error.

- All references to "Spaces" have been removed from this build. Apple no longer allows users to choose how many Spaces they'd like to have - you must use that "+" button in Mission Control to add new Desktops.
- Launchpad seems to finally be working well - there is no longer any lag when opening or creating folders.
- The current view type in iCal now has white text, instead of black (for easier reading)
- "New Folder" icon in Finder
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- In addition to the new login interface, Apple has expanded it to wake-up from sleep:


