Calia Menethil reclaiming leadership of Lordaeron has been expected since her reemergence in WoW. This indicates a greater likelihood of the faction merger coming to fruition in this next expansion; I hope BlizzCon announces cross-faction raiding so I can be a fluffy fox and still play with my Ally guild!
I don't think we'll be getting Lightforged Forsaken, however, as this will be a lore character only situation [much like how the players could not be an Blood Elf Forsaken like Sylvanas].