http://m.youtube.com/watch?v=c19kn3drdFU

Undoubtably go the way of the Rotary, Orbital, V-Due, Stirling and steam engines (plus countless others), despite what the manufacturer claims.

Interesting and not one I had seen before.

Main stated benefits seem to be the reduction in rotating mass (reciprocater V conventional crankshaft) the ability to run higher compression ratios without valves in the combustion chamber and a big reduction in the parts count so presumably lower manufacturing / service costs.

I'm guessing that set against would be the cost / complexity of manufacturing the reciprocator component. As it's basically a rearrangement of the reciprocating piston powered combustion designs we are all familiar with it probably has a higher chance of success than the complete rethinks like the Wankel engine.

Personally I think the true future engine will be the electric motor as it has so many advantages over oil burning. All depends if energy density in batteries can ever be raised to a realistically practical level.