This is the kind of expansion I would like to see as far as progress goes. Here are the zones in progression, lvl of mobs in the zone and the equivelent zone at lvl cap. Zones in Red are instances.
Timorous Deep: New starting zone/city. Current comparison = Greater Feydark
Firona Vie: lvl 65-70 solo/heroic mobs. Current comparison = Lesser Feydark
Solo/Heroic Side
Swamp of No Hope: lvl 65-75 solo/heroic mobs. Current comparison = Barren Sky
The Field of Bone: lvl 70-75 solo/heroic mobs. Current comparison = Bonemire
Kaesora: lvl 70-75 heroic mobs, Current comparison = Acadechism
Kurn's Tower: lvl 75-80 heroic mobs, Current comparison = Oblisk of Blight
Emerald Jungle: lvl 70-80 solo/heroic mobs, Current comparision = Loping Plains
City of Mist: lvl 75-85 heroic, Current comparison = Unrest
Trakanon's Teeth: lvl 75-80 heroic, Current comparison = None with this difficulty.
Sebilis: lvl 80-85 heroic, Current comparison = Nizara before nerf.
Epic Side
Lake of Ill Omen: lvl 80-85 heroic, Current comparison = None with this difficulty.
Warsli's Woods: Same as Lake of Ill Omen
Veksar: lvl 75-80 epic x2, Current comparison = Roost (only much bigger)
Crypt of Dalnir: lvl 80+ epic x2, Current comparison = Labs when you do it with 2 groups.
Frontier Mountains: lvl 80+ epic x2, Current comparison = None with this difficulty
The Overthere: Same as Lake of Ill Omen
Mines of Nurga: lvl 80 +epic x4, Current comparison = Deathtoll
Temple of Droga: lvl 80+ epic x4, Current comparison = Freethinkers Hideout (but longer)
Howling Stones: lvl 80+ epic x4, Current comparison = Emerald Halls
The Burning Wood: lvl 80+ epic x4, Current comparison = Emerald Halls if it was an open zone.
Skyfire Mountains: Same as The Burning Wood
Chardok: lvl 80+ epic x4, Current comparison = MMIS (if current progression wasn't jacked up)
Veeshan's Peak: lvl 80+ epic x4, Current comparison = None of this difficulty
The Dreadlands: lvl 80+ epic x4, Current comparison = None of this difficulty
Karnor's Castle: lvl 80+ epic x4, Contested zone similar to Mistmoore Castle but much more difficult. Only the top guilds in the game would even make it inside and making it to the boss would not be guarenteed even for them.