For all practical purposes, black holes are spherical. The event horizon of a rapidly spinning black hole may be slightly oblate. The putative singularity at the center of a rapidly spinning black hole could be disc shaped, as opposed to a point. Chances are good, however, that singularities will be resolved by a correct treatment of quantum effects [i.e., a theory of quantum gravity]. For discussion, see http://www.einstein-online.info/spotlights/bh_uniqueness.