Full patch notes: http://us.battle.net/sc2/en/blog/7747193/Heart_of_the_Swarm_Beta_Patch_201_Notes-10_31_2012#c-7007821228

Clan Support: http://us.battle.net/sc2/en/blog/7747190/First_Look_Clans_Coming_in_Heart_of_the_Swarm-10_30_2012

UI Changes: http://us.battle.net/sc2/en/blog/7634957/Heart_of_the_Swarm_UI_Update-10_18_2012

Leveling System: http://us.battle.net/sc2/en/blog/7681240/Heart_of_the_Swarm_Preview_Leveling-10_25_2012

Balance Patch: http://us.battle.net/sc2/en/forum/5671338/

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