Ah those trusty cleaners. They seem to find everything out before anyone else, but they're seldom wrong. AMS with and AMS airframe wouldn't surprise me, as apparently the route was only dropped due to the EZY base opening over there and they wanted to use the slots for other route(s). Now established, maybe they'll come back to NCL.
I doubt KEF would work either, Pula was dropped by LS although Dubrovnik and Split currently served from NCL, and as for IOM, I'm not sure if there's that much demand for a 319, alongside the service with Manx. I believe that the IOM itself subsidises the flights between IOM-BRS and others regardless of pax numbers, so enough of an incentive to remain on these routes. As for the others on the list however, it would be interesting to see something new from somebody, sure it will look nice on the arrival boards, but whether it works is another matter.
Aircraft #4, not in the next couple of years no, I wouldn't say never just yet though