The change log states the following:
- Dynamic family tree that shows more family members.
- See grandchildren, siblings, aunts, uncles, nieces, nephews & cousins in your family tree.
- Ability to change your tree to display direct ancestors only.
- Purchase monthly memberships via In App Purchase.
- An updated look and feel that’s both beautiful and functional.
That seems like a good list for a 4.0 version! The dynamic family tree is pictured to the left. Handy buttons at the top enable you to switch on or off the direct ancestors only feature.