Blizzard added a new feature to this week’s 10.1.5 PTR development notes, giving a “Welcome Back Gift” to characters that haven’t been logged in for “an extended period of time”, featuring a full set of gear and more.
10.1.5 Welcome Back Gift (Source)
The PTR notes have been updated with the following:
Characters level 10–60 that have not been logged into for an extended period of time will now have the option to receive a Welcome Back Gift on the character select screen. The Welcome Back Gift includes:
Select a specialization upon log in to become equipped with updated bags and gear that is appropriate to the character’s level and selected specialization. All previously worn items and bags can be collected from the mailbox.
Teleport to the character’s home city of Orgrimmar or Stormwind.
All quests in the quest log will be cleared to provide a clean slate. To continue your leveling journey, head to Chromie in Orgrimmar Embassy or Stormwind Embassy.