To me this aircraft looks like an evolution of the BN which operated successfully in PNG and through the Pacific.
Well it looks a lot more 'refined' than the good old BN2, and I certainly hope like hell that it's a lot quieter.
For those of you who didn't experience the joys of flying the BN2 (and 'yes', in PNG too), see hooligan88b's totally accurate description of the aircraft here (post #2)
BN2 Islander - PPRuNe Forums