It's no secret that World of Warcraft made Blizzard a bagillion dollars and continues to be incredibly popular. However, Blizzard is now unable to do anything without it's fans going crazy and this is a good thing.
According to a forum poster on MMO Champion Blizzard has filed a trademark for something classified computer game software. This something is called 'Eye of Azshara' and it could be another DLC for WoW or a future expansion to Hearthstone: Heroes of Warcraft, another hugely popular game.
Blizzard also has a trademark for 'Overwatch', another super secret thing rumoured to be WoW or Hearthstone related. We may find out during Blizzcon which is going to happen later this week but in the meantime lets just speculate because speculating is fun and exciting.
We'll be sure to keep you informed once we know more. Stay tuned.