I almost don't see the point in the 320 anymore. With the 365 Fuse, they now have a "full sized" 365.
The 365 doesn't seem to suffer from the phantom discharge problems of the 320 and the design allows for a lower bore axis.
I absolutely believe that if Glock had won the M17/18 contract that Sig would be stopping P320 production and focusing on the 365.