I called yesterday, and was told for USA departures, not going to Canada or Bermuda, you don't even need to file for exemption anymore to cruise as an ADULT unjabbed. They said they are cruising with, "a higher % of vaccinated guests than that the general population". (which in the USA roughly 66% of the population are considered fully vaccinated, US Coronavirus vaccine tracker | USAFacts)
I was told that they could tell me at time of booking if that sailing was eligible to book for nonjabbed, or if it had hit the capacity.
Per their own message, it sounds like very soon, as long as the local countries a ship is visiting, they plan to move away from restrictions. "As we begin to transition to a point where everyone, regardless of vaccination status, will be able to sail with us once again, we continue to work closely with our destination partners." 🥰🥰