Maybe embraer will look into re-starting the line with new engines, wing, avionics, higher weights/performance etc like Viking Air is now doing with the Twotter...
The "new" DHC6-400 is the same MTOW and MLW as the previous DHC6-300, with -34/-35 engines, an STC that has been around for some years. The major difference is the empty weight (due to new technology), reducing the -400 weight to around that of the original -200, just over 3,000 kg, although the Viking web site does not give an empty weight for the "new" -400.