Open world games are a big thing, and many players enjoy the exploration of them, seeking out secrets. SoD is a perfect setting for this kind of thing--adding little, almost-unnoticeable things to the game world that would get players speculating and talking. I mentioned in another thread how scientists, for example, would appear at a certain government-run area at certain times in GTA V, apparently taking notes (and if I recall correctly guarded by armed soldiers or black-suited men). It was cool, it drew you into the world, wondering who these guys were and if there was some secret to uncover. I'd love it if a plane flew overhead in SoD VERY rarely (maybe one out of a thousand players does whatever 'triggers' it to spawn), just for the randomness of it (and, again, to get us speculating and wondering). It would be awesome for some player to stumble on a way to enter the sewers, finding an entire network of weapons, items and undead (unique waterlogged guys with squishy sound effects). Maybe an ultra-rare note that pertains specifically to the cause of the outbreak and opens up a very-rarely seen mission that nets players gas masks or a new type of weapon. I was excited to find that the movie theatre in SoD was apparently locked (on my first playthrough) and hoped there was some secret to entering it and maybe a cool fight or easter egg inside. Guild Wars had a floating castle that no player could reach, but there was much speculation and a few in-game hints around it. A huge, cool-looking area that players tried to guess the secret behind. There's plenty of room for these sorts of fun little bits in the sequel, from what I'm reading and hearing. EDIT: As I read over this I realize that what I'm long-windedly trying to say is that I love mysteries in open world games, from the insects in jars in Skyrim to the many rumors of GTA San Andreas back in the day. I hope SoD 2 has plenty of them.