Ooh! A new faction preview! Thanks for linking!
The "factions" were a staple of the Planescape campaign. The main city of the setting, Sigil, was run by fifteen factions, each with a different philosophy. The Doomguard's was entropy; everything decays, rots, and falls apart; it is the truth of existence.
The Planewalker people are making the new official PS stuff, so they're showcasing the new face of the factions since those were such popular and recognizeable aspects of PS.