Some of my findings...
- Whenever you activate expose, it brings all windows to your primary display only.
- Even if an app was on the secondary screen, it still moves it to the primary one when you switch to the 'all app windows' mode for that app
- When you click and hold on any icon in the dock for which app isn't running, you get the standard white menu.
- If you click and hold on an app which has windows open, it brings up the black menu.