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Yes there probably is because in the FAQ in WoW Cata, it had a question which asked if there was going to be a new hero class. Blizzard said that in Cata they were focusing in the classes and races to add changes or to alter the game play of them.
They also stated that there might be a new hero class in the future which sounds like hints that they are going to make a new expansion.
We have to wait it out and see.
What else can I help you with?
Who created blizard entertainment?
Michael Morhaime, Allen Adham and Frank Pearce
When was Blizard Building created?
Blizard Building was created in 2005.
When did William Blizard die?
William Blizard died in 1835.
When was William Blizard born?
William Blizard was born in 1743.
When was Thomas Blizard Curling born?
Thomas Blizard Curling was born in 1811.
When did Thomas Blizard Curling die?
Thomas Blizard Curling died in 1888.
When was Rohan Blizard born?
Rohan Blizard was born on 1984-05-20.
What is the season of a blizard?
snow
What is more powerfull a blizard or atornado?
a tornado is stronger
Where and when do blizards form?
blizard forms in cold areas
Where is TM blizard in Pokemon SoulSilver?
in arcane grove
What is the famous dance in karnataka?
bacause it had to do with the blizard of 1943
