If people don't remember, keep in mind they did exactly this with Shin Megami Tensei IV in 2012. The debut trailer for the game was only available within Soul Hackers 3DS. The trailer was inevitably leaked to the public 3 days before the game was released in Japan, and Atlus rapidly took down all of that. The trailer was only officially released to the public a month later, to Atlus' YouTube channel.