And as always I will tell you that:
1)Arnor will not become a faction, while I would be reticent to say such definitive matters normally the Team has made it clear that Arnor is too similar to Gondor to deserve its own spot in the limited roster of factions that can be implemented. Perhaps one day a submod will emerge allowing such a thing but the Edain Mod will remain like that.
2)As for the Men of the East faction there is still hope, two mystery factions remain and the wish of the community is to have a faction as such. While this does not confirm it in any way it is likely that the Team answers our prayers since it would complete nicely their roster of factions, would balance the evil/good ratio and would please the community greatly. So, all you have left to do is arm yourself with patience.