Source: https://twitter.com/LizardSquad
They apparently started last night by DDoS'ing Blizzard US East servers for Diablo III, Hearthstone, and WoW. Proceeded to Path of Exile and Riot Games, Downed Club Penguin (Lol wutever on that one), and pretty much make an uproar on game forums.
Now today, they proceeded to down PSN, plaster the servers with pro-ISIS images, and send a bomb-threat to the CEO of Sony causing his plane flight to be landed for a bomb inspection.
So....another big hacking uproar if you wanna call it that.