I have no idea what the current devs have in mind for when they will release the Fruma update and this idea may go against their vision of releasing the update, but this is a suggestion nonetheless.
Whenever, the update for Fruma drops, instead of straight up letting everyone in, we would instead wait at the gates. The gates would actually stay closed for let say... 8 hours. A new unique, one time only world event could occur: The opening of the gates of Fruma. It would be an event where all players can gather up and see some kind of exclusive cinematic or cutscene of the gates opening. The goal of this would be to create a unique and memorable experience for all players that may wish to interact with the community, similarly to the first Prelude to Annihilation event.
This event would obviously only occur once ever, and because of that, it shouldn't give any special rewards. It could give a starter reward for those who were present at its opening to the new province though. As for if the event should contain a fight, I guess it's up to the devs and their current vision on how they want to make the introduction lore to Fruma be.