There is a rumor that Bungie will have their own showcase in the next couple months to formally present Marathon and I think that's for the best.
With the predisposition from detractors to hate on the SoP and the predisposition from PS fans to hate on services, Bungie talking to THEIR people first is the smartest and healthiest move. Obviously the game will be included in a SoP at some point because it has to be presented to the entire PS playerbase but by that point with a little luck people who actually care and want to play the next big thing from Bungie will have already made their minds without getting influenced by the usual negativity around PS events.