This is Sikorsky's new attack helicopter, the X2 Raider. It's based on the 482km/h X2, but it will be able to carry troops and weapons at extreme altitude. And according to Sikorsky, it's almost as silent as the fictional Airwolf.
Given its size, the X2 Raider won't fly as fast as the X2, but it will crush rivals at 200 knots in cruise mode, and 220 knots in dash mode, while being capable of transporting six fully equipped soldiers. Navy Seals are going to love this one when it comes out in four years. [Sikorsky]