Mists of Pandaria data added many unique weapon models that were never obtainable to players. It looks like many of these appearances will be finally available through Timerunning: Pandaria!
The vast majority of these unused weapon models have icons named «pandaraid» or «panprog» indicating that they were created early in Mists' development but not used for content at launch. The weapons resemble those used by the denizens of Pandaria, such as Hozen or Jinyu, or something more ornate that wouldn't be out of place in Terrace of Endless Spring.
As we've been playing through Timerunning: Pandaria this weekend, we've found one so far in a Bronze Cache. Are you hoping to get your hands on any of these weapons for transmog? Let us know!