A new Metal gear solid game has been unveiled with the title 'Metal Gear Solid: Ground Zeroes' and will be running on the new Fox engine.
It is said to be an open world game and was showcased during the Konami's Metal Gear 25th Anniversary event.
This is what one of the guys tweeted about the demo
@markmacd tweeted, "Demo of "Metal Gear Solid Ground Zeroes", started w cutscene (all realtime), went into gameplay, open world, night, raining, base. AMAZING," followed by "Snake crawled @ avoiding searchlights, killed guard, rode jeep, called in heli for evac. Sounds like MG, but the scale & atmosphere... Wow."
Here's the opening trailer
Source --> IGN