False
Rob Nelson, who co-runs Rockstar North, told Famitsu you can switch to either of them. It only locks during some story scenes, the same way GTA 5 did with Michael, Franklin and Trevor.
True
What you eat actually matters now
Nelson told Famitsu food gives you buffs, three gym sessions three days running levels you up, and eating a lot makes you heavier. Starving to death like CJ is the made-up part. Nobody from Rockstar or the previews mentions hunger.
True
Snapmatic is back, but you can't post
Nelson to IGN: "We have Snapmatic. You have people that you follow and you can also just browse it." Posting? "No, because you're a couple on the run. You just lurk." You can still send photos to your partner.
Reported
You can't buy a house
People at the previews say safehouses come with the story, and Nelson told Famitsu you move between them as it goes. What you can buy is garages. You start with room for three cars. GTA 5's story didn't let you buy houses either.