The actual job listings, found by Game Johou, reveal the project details. First, the title(s) are for PlayStation 3 and PSP. Media Vision is also building these games with international markets in mind. The planner description explains they want to make this project appeal to game users around the world.
Media Vision says to potential recruits this is an ambitious project and will be a long term job.
While Media Vision is no stranger to the PSP (they made the hex-grid strategy RPG Wild Arms XF), this yet to be announced title is their first confirmed PlayStation 3 game.