Currenly when you run a global change, you can't see a complete list of the records that were just changed or are going to be changed. For some global changes this would be ok because you could just refer to the selection you used in the chage. The issue is when you check the "Remove from exisiting records" options, there is now way of seeing what records are going to be changed or were just changed. It would be helpful if you could download a file or view a selection of these records.