This Means War! Is a cancelled third person team-based shooter that was in early development by bigBIG Studios around 2009, planned to be released on Playstation 3 or PSVita. The team was mostly known for Pursuit Force and Little Deviants, but they worked with Sony on many more canned projects, such as Survive, Autorobotica and this one.
By looking at the only remaining images we speculate This Means War!’s gameplay could have been similar to Battalion Wars, possibly with a huge emphasis on team VS team online multiplayer. Players would have been able to use military weapons and vehicles to fight other teams on small spherical levels (somehow similar to Mario Galaxy planets). Many different character classes would have been available as DLC to be purchased on PSN, each one with different skills, appearance and nationality.
Unfortunately as far as we know This Means War! was never officially announced by Sony nor bigBig Studios, so we don’t have more details about the project and why it was never released. In 2012 Sony closed bigBIG Studios: some images from This Means War! are preserved in the gallery below to remember the existence of this lost project.
Thanks to Tonz for the contribution!