Space Marine 2 was a massive success that trumped expectations. With that in mind, it shouldn't come as a surprise to learn that a third game is already in development. Space Marine 3 will be developed by Saber,

Focus Entertainment and Saber Interactive confirmed they have strated work on Warhammer 40,000: Space Marine 3, coming in the future

Focus Entertainment and Saber are already working on Warhammer 40,000: Space Marine 3 after the runaway success of Space Marine 2. Today, Focus announced that development on the third game in the series "has officially begun," promising more of what players loved and some new additions that will further polish the winning formula.