I just noticed that neither Ghosts of Harrenhal or Tyrion's chain are in the upcoming section. Considering the delays with the release of For Family Honor and the still unknown release date of Lions of Casterly Rock (as well as the end of any Games Workshop licences products), do you think this may become something to be concerned about for the future of the game?

Nothing to worry about in the long term. Development is probably moving along, but the shipping of packs is delayed. One of the vagaries of international printing.

When the 8th largest shipping company loads all of their ships, sends them to sea, then declares bankruptcy things get slow and scary. A lot of companies have product sitting off shore that can't be unloaded because their is no company to pay the docking fees. Some have publicly said they are stuck (Wizkids) others aren't saying anything.