Reports of sightings (kinda have those already)
saveable game (so you can pick up where you left off..)
ports.
To be able to cruise the world at will, meet up wtih friendlys for repairs and fuel (as you can now) and have a fully cycling time system, and docks to leave from/return to seem like they might not be that hard to do, but im no "dev". The upside to this is a game that never gets old, and has unlimited playability...which cant be a bad thing!
I really like the gramphone in sh3 too!