here are all the new details for Uncharted 4 via gameinformer

[Nomad1]

- Focusing on navigational freedom for this entry
- Showed multiple paths, one finding an extra cave, other bypassing a group of enemies

This, so much. The series definitely needs more freedom

Exactly. I always felt that Uncharted 1, 2, 3 limited our freedom despite the great environments it covered. That cannot happen in a treasure finding type game.