There are a few features that I would like to see.
1. I should be able to search my tree by a criteria other than name. I would like to search by place. So, if I find a newspaper archived from someplace I can check for other members of my tree who may be in the pages.
2. I would like more analytical tools for the data in my tree. One would be a map. Couldn't there be a map by year? So that, say, anyone who was alive in 1850 would show on a map? Couldn't there also be a way to measure life expectancies or birth rate?
3. I would also like to see analytical tools for my tree itself. So, couldn't I see how many people were in it and when I added them?