Actually, released touches will be found in the changedTouches array, ie:
e.changedTouches[0].pageX // get the end x page coordinate for a released touch
I think this is slightly more reliable than going through the originalEvent property.
You can read more on changedTouches here:
http://www.w3.org/TR/touch-events/#changedtouches-of-a-touchevent