Sony and Guerrilla Games are hosting a second Horizon Hunters Gathering playtest to help get feedback on how to make the multiplayer game better while it's still under development. It features several new additions, including two fresh characters and a new region, among other things. Like the first playtest, this one is closed, so not everyone who's interested will get to take part. Below, we explain how to get into the Horizon Hunters Gathering playtest and what to expect from it. How to get into the Horizon Hunters Gathering playtest ""> Image: Guerilla Games/Sony Interactive Entertainment The second Horizon Hunters Gathering playtest is a closed one, like its predecessor. Sony and Guerrilla Games are hosting what they call sign-ups via the PlayStation Beta Program, though "sign-up" isn't the most accurate description. You're essentially just registering interest, and there's a random chance the program may select you for participation.…