Yes. Black has 170 in attack and 120 in special attack and white has 170 in special attack and 120 in attack. Stat total of 700 instead of 660 for regular Kyurem.
Those are the major differences.
No information about them has been released except that their true Names are Black Kyurem and White Kyurem. More information will be released soon enough, so be patient.
Information obtained Here