They have confirmed though that primal battles in itself are staying mostly the same. So is it going to be like FFXI Sandworm where engaging it in a fight will throw you and your party into a special battlefield?
Or are the roaming primals and the primal fights for weapons considered different content? I know they've confirmed both, so I'm interested to see how they will pull this off.
So there was some clarification after E3:
The Roaming Primals, will not be fights out in the open, they will be an instanced fight, but the instance will roam and you will have to find it, so yes, like the Sandworms.
They have given no clarification on if the primal weapon battles will be separate, but I assume so.
Basically, the roaming version will be akin to Ifrit Extreme, limited to who can claim it, while the Hard mode for weapons will be accessible for all.