Crew Dragon builds on experience with ISS resupply
SpaceX is developing a human-rated version of their Dragon spacecraft for NASA's Commercial Crew Development program.
The company is taking the lessons learned from the many flights of the cargo version of the capsule and taking the design to the next level. It will incorporate a reusable "pusher" launch escape system powered by eight SuperDraco thrusters. Those engines double as a possible system for future propulsive landings.
The spacecraft will be able to carry as many as seven people to and from the International Space Station, or any other space station with an International Docking Standard adapter.
The company conducted a Pad Abort test on May 6, 2015 and plans an in-flight abort sometime in 2016. The first orbital test flights are expected in the mid-2017 time frame.