The extended look and the interviews around it treat Jason and Lucia as two playable people in the same life. I am writing this as a fan reading that footage, not as someone who has held the disc. The switch seems real. The rulebook is still fuzzy.
The answer I am comfortable giving
Yes - the game is being shown as a two-character GTA. In the extended look you can be Lucia driving and then Jason leaning out to shoot, or sitting in the passenger seat scrolling a phone. That is a very different energy from three separate lives in Los Santos.
I would not tattoo 'anytime, anywhere, no restrictions' on it. Story missions have always locked GTA into a camera for a reason. If a scene wants you to feel Jason's military habits, Rockstar may take the stick away from Lucia for a minute. That would still count as switching existing.
Why this does not feel like copying GTA V
GTA V switching was a teleport between schedules. Franklin could be in the hills while Trevor was exploding something in Sandy Shores. Jason and Lucia are a couple in the same state, often in the same car. A switch here looks more like changing who has the controller in a shared scene.
That is catnip for fans. A chase where I drive as one and shoot as the other is the fantasy. It is also the kind of thing trailers love to show at its sexiest. I am excited. I am also waiting to see how it feels when they are across town from each other.
What about missions?
Reports around the showcase, including the Famitsu conversation and magazine previews, describe free swapping that sometimes gets taken away on purpose. That matches how Rockstar already directs story. It does not match a YouTube thumbnail that says you can swap during every second of the campaign.
My working read: free roam is flexible, set pieces are directed, and the fun is in the overlap - the jobs you do as a pair. If the final game only lets you swap in a menu between missions, that would be a downgrade from what they showed. I do not think that is the pitch.
What I am still watching for
I want to see the actual prompt. D-pad? Character portraits with a heart between them? A meter that sours if you play like a jerk as one of them? Those details are leaking through previews more than through the official site.
Until I can pause a build, I am treating switching as 'yes, and it looks closer than GTA V' rather than a finished wiki page. That is enough to get hyped. It is not enough to write a controls guide.