What I want:

New modes:

Rival Wings
Capture the Flag. Map: Ala Mhigo (Lore: To raise combat spirit and have tactical training in case Garlemald strikes back)

Frontlines
Bring back Slaughter

New Maps
Dark Misty Forest/Swamp area complete with puddles that heavy you. (FL Seize Map)
West Shroud (FL Shatter Map) We have already seen artwork with crystals sticking out of there. Would work perfect for Shatter.
Azim Steppe (FL Seize Map)
The Hand of Rhalgr (Duel Area)
Ishgard Cathedral (Feast Map) 2 stories on this map, you can take the fight to the roof where the Wolves Heart spawns.
Ul'Dah Coliseum (Feast Map) Plain Map, No Walls.
Azys Lla Combat Facility (Feast Map) Allagan Walls rising up from the floor at certain times, taking advantage of that to LoS people.
Kugane Sewers (Feast Map) Complete with sewer water spewing that you can LoS with, Rakuza cheering in the background.
The Lochs Saltmines (Feast Map) Gotta watch out for mine carts that pass by.
Ruby Sea Island (Feast Map) Respawn point in a raft close to it. Hide behind Palm Trees and Bushes. Water Oasis in middle.

I like dynamic stuff happening on the maps, but it would be fine without it too.