The latest info from NASA is that the interim version of the SLS to first launch in 2017 will have a 90+ metric ton (mT) payload capacity, not the 70 mT earlier cited by NASA. This is important because this is in the range to allow a manned landing mission to the Moon.
This will require an Apollo or smaller lander, not the 45 mT Altair lander of the Constellation program. It will also require a highly weight optimized service module, not one based on the ATV. If instead the service module is based on the highly weight efficient hypergolic Ariane 5 second stage which using the Aestus engine is also highly Isp efficient, then the mission can be done within the 90 mT payload capacity of the first launch of the SLS in 2017.