Grand Theft Auto VI will let you switch between its two leads, Jason and Lucia, both while exploring the world and during certain story beats. It is the first mainline GTA to do this since GTA 5's three-character system, but here it is built around a single partnership rather than a trio, with an emphasis on missions you tackle as a duo.
That switching mechanic is the part Rockstar has spoken to directly. A wider set of details has also surfaced through a Brazilian retailer listing, describing an in-game phone that feeds you viral videos and Vice City influencers to follow, side missions you uncover through social media, and NPCs running their own daily routines that spin up random events around the map. Treat those as strong signals rather than confirmed features until Rockstar says so.
Taken together it points to a more reactive, lived-in Leonida than past games. We are tracking each detail and will move items from rumor to confirmed as Rockstar makes them official.