My theory on how the game will begin
My theory is in the beginning of the game Jason is going to be a some low-life druggie, since if you look at the leaks Jason looks like a typical skinny druggie dude, maybe even both characters will be. Also according to the leaks theres a mission where they are robbing a diner and risking their lives for a few bucks, something low-life druggies do. After running from the cops they're going to be caught and Lucia is going to end up in prison, maybe Jason ended up getting away or served lesser time. Maybe Lucia refused to rat on Jason thus landing her in prison, yada yada. The trailers have shown the couple driving away from a crime (maybe the diner they robbed) and Lucia getting released from prison and finally reuniting with Jason, who seems to have turned his life around. (Health/drug wise i mean) thus beginning the second act of the game.
The skinny druggie Jason may have been just an early concept of who jason was going to be, or it may be relevant to the story who knows.