The SD40-2 is not cancelled. No projects really ever are. It just needs enough reservations to go forward. Right now I don't know the exact number but it's just not there. Scott and those of us who assist him thought this would be a great model for the market, especially 2 rail, for a good quality and accurate diesel that would be at home on a post 1972 layout to this day. The GP40-2 question is just that. A question. I'd love to see the SD40-2 go forward and it would be a nice gateway to more modern offerings. The interest just doesn't seem to be there at the moment.
As with everything, time will tell.