A much more attractive schedule indeed. I'm pretty sure they'll just leave the plane at SOU because there isn't much they can do inbetween. Even with 30 minute turnaround times everywhere, the best they can do is a 1 hour flight each way. That doesn't get you very far in the lovely but slow F50.
That being said, SOU to LEH is only 117 miles. So if they really want to connect the major European ports, they might as well add that one to the list.