A wider viewpoint on this over at Bayou Renaissance Man is the source and well worth a read.
The Sikorsky S-97 Raider is a proposed high-speed scout and attack compound helicopter based on the Advancing Blade Concept (ABC), under development by Sikorsky Aircraft. Sikorsky planned to offer it for the United States Army's Armed Aerial Scout program, along with other possible uses.
Looks like the proof of concept is well along in development. Really cool stuff.