Mission Control is a powerful and handy new feature that
provides you with a comprehensive view of what’s running
on your Mac. It gives you a bird’s-eye view of everything
— including Exposé, >>> Spaces <<<, Dashboard, and full-screen apps.
There you can see your open windows grouped by app, thumbnails
of your full-screen apps, Dashboard, and >>> even other Spaces <<<,
arranged in a unified view.
Then again, the screenshot provided doesn't seem to show any hint of spaces.
[Edit: Perhaps the spaces appear alongside the full screen apps?]