When setting up a map series, having the ability to create expressions using the "current page" value would be very helpful. One use case example would be to label adjacent pages differently. If the adjacent page field1 is equal to the "current page" field1, the label might be red and if not, label would be green. Another use case example would be adding a definition query to display features if field1 = ALL or field2 = "current page". The fields are not the field driving the map series so a Page Query won't work. The fields might be on the map series index layer or on other layers in the map.
