Deadline says

The big question following this expected announcement is whether Redbox and Blockbuster will tell Warner Bros to take a hike and buy the studio’s new discs from retailers. That’s one reason why other studios have been reluctant to push for the longer window. But Warner Bros made the announcement at the 2012 International CES because it’s eager to push low-cost rental services aside in the hope that the entertainment industry’s new UltraViolet initiative will boost sales of DVDs and Blu-ray discs. (Blu-ray, DVD, Netflix, Warner Bros.)