Shinyo here (under a temporary account due to login issues)
Release date is confirmed for June 26th, 2012 on the Darksiders (THQ) facebook page, ran by THQSledgehammer (community manager for Darksiders and Warhammer 40k)
Just learned today that THQ announced its pre-order bonuses today (with some nice screens I uploaded to Death's page)
http://community.darksiders.com/go/thread/view/138695/28918439/Darksiders_II_Pre-Order_Incentives#