since it is using Same engine than farcry 2 (Dunia Engine) that was by itself a derivarion of CryTek engine at the time, i think the game will run with graphics close to that games, Farcry2/Crysis1, since it will be jungle there will be a much heavy scenario for rendering so i think that recommended for dx9 will be something like a gts250 or equivalent for a dx11 (if supports) good gameplay i think that "recommended" will be 6850 or close to that.