IGN's Red Faction: Guerrilla Preview outlines the additional content planned for release with the PC edition of Red Faction: Guerrilla to make up for the wait since the console releases of Volition's shooter sequel:

Much more than a simple port of the console game, the PC build of Guerrilla has been in production for more than a year by Reactor Zero, a studio out of Ann Arbor. Apart from adding in the Demons of the Badlands content, the developers also packs in six new Wrecking Crew maps from the latest dlc pack, the two exclusive Wrecking Crew maps that were only available for players that pre-ordered Guerrilla, and two multiplayer maps that are exclusive to the PC version. The PC build will also get access to two new gameplay modes: bagman and team bagman, and while we weren't told about these two modes, it's nice to know that all of these items will be tossed in for free. For players that are interested in achievements, there is also Games For Windows Live support as well.