Location: In Geo-synchronous orbit over redass' bathroom,
2013 is the rumor date. the heads are set up for it as of 2011 but the system wasn't installed. with the new ecoboost v6 in development i would guess that Ford plans to use it and the DI 5.0 RR engine to meet the new cafe standards. and as always an HP/MPG jump is welcomed.
op if you're planing on buying id wait. if anything you'll get a better deal on a 2012 by the time the DI rumors have been confirmed/denied.