I don't like the idea of swiping left/right to get to notifications or mission control. It's too easy to accidentally trigger that if you just wanted to go left and right on the home screen, and a few new people might panic and start calling their sons for help. I think up-down for notifications, as it is now, is good and mission control should use a down-up motion. This is a bit more logical since the multi-task tray already starts at the bottom, so mission control can be visually explained as an extension of multi-tasking interaction.