It looks like there are 2 incentives available currently for the X3: a $455 Option Credit (for the power tailgate) plus a $500 Credit (the MI credit?).
2015 X3 xdrive28d
Black Sapphire Metallic/Black Nevada/xLine, Cold Weather, DHP, DA, DA+ w/ACC, Lighting, Premium, NAV, HK Audio, Parking Assistant, Enhanced BT
Previous BMWs: 2000 528i, 2003 540i, 2007 335i Sedan, 2009 335i Sedan, 2012 X3 xDrive35i