Ah, cool. It seems that the main quest is exactly what was advertised though. Shame because I was hoping to meet and fight along side older Cidney, Iris, and Aranea. The side content sounds dense and interesting.
That's only the cure for insomnia questline. There are other questlines in the final chapter now too.
Getting the new regalia is one of them, but we don't know what we use the regalia for atm.
It's possible that there are other hidden quests not shown by the datamine
Edit:
Here are some we know of:
1.A Gift from Cid - we can assume this is getting the new regalia
2. Glaive out of Time
3. Crown City Without a King
And we know this one thanks to @Storm:
4. Relics of the Empire
Though the Niflheim Empire fell more than a decade ago, remnants of its infantry have set up camp in Insomnia and stayed there to this day. With Cor's aid, Noctis and his royal retinue now aim to kick the empire out of the Crown City for good. Speak to Josef. Destroy the imperial bases. Destroy the imperial bases (0/3). Destroy the imperial bases (1/3). Destroy the imperial bases (2/3). Report back to Josef.
Relics of the Empire: First Base
Noctis must eliminate all imperial enemies from the base without being detected. Warp-kill imperial soldiers (0/5). Warp-kill imperial soldiers (1/5). Warp-kill imperial soldiers (2/5). Warp-kill imperial soldiers (3/5). Warp-kill imperial soldiers (4/5). Wipe out the imperial forces.
Relics of the Empire: Second Base
With Cor's assistance, Noctis must eliminate all imperial enemies from the base. Wipe out the imperial forces. Head to the destination. Wipe out the imperial forces.
Relics of the Empire: Third Base
Noctis must eliminate all imperial enemies from the base within the allotted time. Take out the watchmen within the time limit (0/4). Take out the watchmen within the time limit (1/4). Take out the watchmen within the time limit (2/4). Take out the watchmen within the time limit (3/4). Wipe out the imperial forces within the time limit. Head to the specified area. Take out the watchmen within the time limit (0/4). Take out the watchmen within the time limit (1/4). Take out the watchmen within the time limit (2/4). Take out the watchmen within the time limit (3/4). Wipe out the imperial forces within the time limit.
Though the Niflheim Empire fell more than a decade ago, remnants of its infantry have set up camp in Insomnia and stayed there to this day. With Cor's aid, Noctis and his royal retinue now aim to kick the empire out of the Crown City for good. Speak to Josef. Destroy the imperial bases. Destroy the imperial bases (0/3). Destroy the imperial bases (1/3). Destroy the imperial bases (2/3). Report back to Josef.
Relics of the Empire: First Base
Noctis must eliminate all imperial enemies from the base without being detected. Warp-kill imperial soldiers (0/5). Warp-kill imperial soldiers (1/5). Warp-kill imperial soldiers (2/5). Warp-kill imperial soldiers (3/5). Warp-kill imperial soldiers (4/5). Wipe out the imperial forces.
Relics of the Empire: Second Base
With Cor's assistance, Noctis must eliminate all imperial enemies from the base. Wipe out the imperial forces. Head to the destination. Wipe out the imperial forces.
Relics of the Empire: Third Base
Noctis must eliminate all imperial enemies from the base within the allotted time. Take out the watchmen within the time limit (0/4). Take out the watchmen within the time limit (1/4). Take out the watchmen within the time limit (2/4). Take out the watchmen within the time limit (3/4). Wipe out the imperial forces within the time limit. Head to the specified area. Take out the watchmen within the time limit (0/4). Take out the watchmen within the time limit (1/4). Take out the watchmen within the time limit (2/4). Take out the watchmen within the time limit (3/4). Wipe out the imperial forces within the time limit.
Likes:
Cloud_CR and FFChocobo18