It would appear there are still a couple of a/c sub-leased to Yakutia Airlines - TF-FIS and TF-FIT perhaps?
It's an interesting relationship between Icelandair and Yakutia Airlines - I recall at least one employee of Yakutia Airlines even studied in a univeristy in Iceland.
...and talking of "odd Icelandair experiences" - flew KEF-JFK in January, and the cabin crew really gave the impression that they did not want to be there on that flight. Admittedly I was in Y, but still... Good IFE and overall the flight was fine - just thought the crew were really miserable. Perhaps they were all just having a bad day.
As for Iceland, I would strongly recommend travelling outside Reykjavik - it's a nice town, but one can find more or less similar towns elsewhere in the Nordic area IMHO. It's a great country and definitely worth a visit.