Interestingly enough, I was able to use the Price & Build web site function and successfully apply the RVR23 code with a river itinerary sailing in 2023 I was looking at.
I had just received an email from my travel agency this morning that references the RVR23 code. From what I can tell, this code applies to river cruises for selected 2023 dates and provides free international air fare from some gateways as well as the $25 deposit. The offer expires August 31.
Regarding the $25 deposit: if you are booking a cruise and you don’t have any existing Viking bookings, I believe you would have to pay in full 12 months prior to the sailing. In that case, it seems that the low deposit is not at all helpful unless the sailing occurs well over a year after your booking date. Anything sailing within 12 months of your booking date, you will need to pay in full at booking time. Right?