I think it would be cool to update and progress area storylines instead of adding new areas.

I imagine there is less overhead since a lot of the groundwork is laid already.

It can hook into global or cabal quests, imagine imperial recruiting posts popping up in towns and villages.

For returning players it adds a new twist to seeing the story of CF playing out and giving them new content with some familiarity.

Some areas to consider.

Seeing if the storm giants invade kiadana
The undead have finally overrun the village of barovia.
Lower cragstone survives an attack

Add trade caravans for east road as a result of the maturing economy between the major cities. maybe go fancy and have them kind of dynamic like the port of hamsah. Include some super high end caravans that are like ancient dragon or other area explore bosses, high risk from both a pve and pvp