After last night's patch, some players are experiencing a bug where no NPCs or interactable objects are appearing in the game due to zoning changes. SOE is working on an official fix for this, but in the meantime, it is recommended that you use a warpstone and it should fix the issue of you being in limbo. If that does not work, it has also been suggested by some players to try server hopping around some.
Update: All servers are being brought down at 2:15 PM PDT for a brief update! We are assuming that this will address the non-viewable NPC bug!