Not unlike the BERP blades then - a higher camber section on the outboard end to provide more lift at slower speeds on the retreating side and a cambered section with a reflex trailing edge to compensate for the twisting moments on the outboard section caused by movement of centre of pressure as AoA varies. The tip will deal with the high speed problems on the advancing side - compressibility and critical mach No - probably the same way as the BERP blades too - a thin, swept tip like a supersonic wing.