New Search Ability
What would be nice to be able to do with my family tree is to search by birthplace location within it. So, for example, enter a search for those in my family tree who were born in Whitby, England. (Nice if I could expand the location radius; 5, 10, 15, 20 miles too). Results would give me all my family born in that area. I could then easily look at how many generations stayed in that area, migration patterns etc.
When your Family Tree gets large it's difficult to keep track of those things. It would be nice, when visiting an area, to easily check if you had any ancestors from there and schedule in research, photography possibilities etc.