According to this source, Royal Air Maroc is set to join Star Alliance soon.
Negotiations are seemingly advanced and the announcement is just days (or weeks?) away.
If true, this would be a major boon to Star Alliance. Western Africa is currently poorly-served by any of the major alliances. It would also be a great help to miles & points flyers, since redemptions in the area are not easy and revenue fares are sky-high.
Royal Air Maroc would add a number of destinations to Star Alliance where it has no coverage or just spotty coverage:
Let's hope it's true!