They've got 3 primary goals for the campaign: Publishing Occultism, bringing you the "Rise" album (the 3rd album for the game), and to continue to refine the company.
Rise is a new "thema" for the game. It's basically their term for a sourcebook, delving deeper into a... well... theme of the world. Occultism primarily deals with esotericism and mysticism (hey, I've been told I'm pretty esoteric. I should maybe check this book out).
From the campaign:
With this new Kickstarter campaign, our objective is to finance two new projects in the Shadows of Esteren Universe: the new supplement “Occultism”, and our third music album: “Rise”.
Beyond financing these two new projects, contributing to this Kickstarter campaign will make you a big part of our adventure because you will be helping us to further our momentum and professionalize our activity. This is no small challenge, but with your support, we can do it!