There have already been cutbacks on food due to cost; e.g., king crab legs and crab cakes in P7. Hopefully, not too much more. As for ports, I think they want to design itineraries that travel at a reasonable speed entire time between ports; i.e., have ports 160-200nm apart and travel at 16kts instead of 80 and 240 and have to travel at 10 or 20kts.
I did get a bit scared listening to FdR's answer to an analysts question regarding cost cutting; hopefully won't impact Regent too much but we need to "cost-cut-shame" Regent for any actual cost cutting that impacts the customer experience (they can cut out the 40-50 brochures I get per year).