This leak comes from DuskGolem:
Essentially, it sounds like players will be controlling the characters like a normal survival horror game, while some sections will pull things back a bit, potentially putting players in control of multiple characters at onceWhat I remember of Overdose is the game was trying to an experimental experience involving players using multimedia to have breakthroughs in the game. There'd be long cinematics that would lead to active and passive gameplay of two kinds, the first being where they had to use, watch, and 'guide' the characters while using information obtained from other sources, like web pages."
They then described being able to switch between first- and third-person to help characters move around the environment. Describing the second type of gameplay, DuskGolem said, "The second gameplay element involved first-person bits aimed at the player that played more traditionally like a horror game but with a similar cryptic puzzle-mystery function and a lack of cinematics like the first part."
. Either way, all of this tracks with what Kojima said earlier this year when he said, "OD is just as different" as Boktai: The Sun is in Your Hand. For those unfamiliar, the Game Boy Advance game used a light sensor on the cartridge that players had to charge before fighting in-game vampires.