Will the 408 be single pilot? It will depend on how Cessna and the FAA certifies it.
Why is FedEx looking a this aircraft? Because FedEx is running as many as 4 Caravans on some runs. A great number of these runs are quite short, so ATR's are not a viable aircraft on these runs due to cycle costs. The 408 will be a growth on the Caravan.
Can't wait to see it on floats.