DICE's Rendering Architect Johan Andersson has warned that some of his company's 2013 games using the Frostbite engine will need the extra bits as a matter of course. In other words, it won't matter if you have a quad Core i7 gaming PC of death should the software be inadequate; if you're still running a 32-bit copy of Windows 7 come the new year, you won't be playing.
http://www.engadget.com/2012/05/22/dice-to-require-64-bit-os-for-some-2013-games/