As the title says
1. DS9 interior revamp.
2. Karemma, Tosk, and Paradans added to Federation playable species, and Dosi, Wadi, and Hunters added to KDF playable species, since we know these governments have relations with those races, and the wormhole to the GQ has been open and used since the end of the war. It makes sense a few members of these races would have joined up for diplomatic reasons.
3. Dominion War 2.0 storyline, and Anti-Dominion taskforce reputation + pve queues.
4. 2 sector tall, by 4 sector wide, playable Gamma Quadrant sector space map centered around the Idran Wormhole's GQ terminus.(the white boxed area in the pic below)
5. AoY style Cardassian faction that can join up with either the Feds or the KDF after their short mission list is done.
6. New Link, Female Changeling, Odo, and Hur'q being involved in the story in some way.
7. Gamma Quadrant themed fleet holding.
8. Cardassian admiralty campaign.
9. DS9 cast VAs
Anything else y'all would like to see in such an expansion? Plot ideas? races? episodes referenced?