In the 1980s, Sikorsky had a test aircraft that they called the ABC (Advancing Blade Concept) helicopter. It used a coaxial rotor, and offloaded the retreating blades to eliminate retreating blade stall (as a helicopter goes faster, the blade going backwards goes more slowly relative to the air stream).
Sikorsky unveiled its successor,
the X2 test aircraft at Heli-Expo:
It's certainly a lot cleaner and more developed than its predecessor.
It also promises performance close to that of a tilt-rotor with the low speed handling and auto rotation of a helicopter.
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