BioWare responded to my Ticket about the unavailable Ilum quests with this reply today:
Despite some replies here that implied the OP's problem was one of LOCATING the quest-givers, this error is obviously a problem on BioWare's side -- not with the players. The daily quests in question had all been previously available to players, as many posts noted. And Ilum's daily quests have (had?) been structured so that it's impossible to miss active, available quests. Quests should light up with "available quest" triangle markers on the map. It's impossible to miss an available quest in a zone, if they're functioning properly. Suggestions that players don't know where to look seem patronizing, frankly. The Ilum dailies are all located in tight proximity of two bases. Anyone seeking them, even casually, should easily see all the available quest-markers lit on the map. The problem isn't one of "locating" them. The problem is one of availability.