Using the "grab & pull down" action to close an app with a mouse was always awkward to me. I'm extremely happy to see all of the swiping gestures going away. I only liked the task / app changing swipe gesture from the left. my guess is Windows 10 will ship with non of it. Since we have Task View and now the charms menu features have been placed into the app's title bar.
It appears Microsoft already had an idea of how Windows 10 would work when they decided to moved the Start Button to the right side on the Surface Pro 3 --- that was really the only reason I used the charms, the Start Button. It was odd holding a device like the Surface (any of them) with one hand to move your hand to the bottom center to press the capacitive start button.