1st, arthas is dead and highlord bolvar turned into new embodiment for lich king, cuz there will always be a
overmind... i mean... lich king...
so, Tirion Fordring had statues erected in the center of dalaran to commemorate the day where lich king *supposedly perished* in the peak of icecrown citadel, and somehow he forgotten the last words his pal highlord bolvar and imbued the statues with moment starting from arthas demise to the scene where bolvar told Tirion 'to forget him and never mentioned about what happened there' (well, everybody who clicked had seen it... great... Tirion's stupidity is incurable...)
as time passed Chuck Norris got bored about all his cool facts being recycled over and over again in barren chat and he farted. the power of that fart whecked both barren and stranglethorn into 2 zones, and scared a dragon aspect (deathwing) out of his hiding place. the toxic gas (contains hydrogen, helium and methane) managed to reignite ragnaros
things not going well on the horde side... the toxic-fart-gas killed cairne bloodhoof and made thrall (who also inhaled the gas) left his 'warchief' post to
emo garrosh due to his increase of horny-ness for orc wiminz instead of hume wiminz (poor jaina...) as the effect from the gas...
as for the alliance side, the gas petrified magni bronzebeard but the foul smell managed to wake up furion stormrage from his slumber. well, the king of stormwind still suffers from split personality disorder (roll an alliance toon and click him for few times, he'll say something like, 'i'm lo gosh, i'm also varian')...
(the interim for the story would be terran confederates abducted few taurens for their space-science project by gearing them up with power suits in attempt to combat zergs but rumors said they managed to break out from the facility...)
Thanks for taking the time to write that out but i'm not asking about lore.
I'm asking game play wise.