(Image credit: Bungie) Marathon director Joe Ziegler has laid out Bungie's vision for the next few seasons of Marathon . If you're looking for a statement that confronts all the doomerism around the extraction shooter's Steam numbers or a followup on Sony's writedown of the studio's value, you won't find in Ziegler's latest communiqué. What you will find is a recap of how things are going in the game itself, including some big experiments in the works. The studio's working on a new map that "leans into alien elements and mind warping debuffs," for instance, but that's still way off. The next Runner shell is a defensive kit named Sentinel. But the most interesting of the reveals are undoubtedly two planned PvE-focused modes coming next season. In Season 2, we will be experimenting with two modes, one at the beginning of the season and one towards the middle/latter half of the season. The experimental mode at the beginning of the season will focus more on PvE, but with a light touch of PvP.…