Found this looking around the web this morning:
THQ's Creative Director, Don Whiteford has announced that Red Faction: Battlegrounds is currently in development at the firm's Warrington studio in the north of England, and will be a PSN title that will tie into Red Faction: Armageddon, which is slated for March 2011.
With THQ hinting that there would be a Red Faction PSN game back in June, today's confirmation reveals that the title will be an isometric arena combat game featuring battles between mechs, tanks and rovers that offers support for up to four-players playing locally on the same screen.
Red Faction: Battlegrounds will also unlock additional bonus items for Red Faction: Armageddon, and although no release date was confirmed, it's highly likely that the game will release before the full retail release of Armageddon, to generate interest and buzz around the title.
Well this kinda explains the red faction trial and full game on psn now - trying to gather some interest for the series