- Launch abort system (superdraco engines on the side of the capsule)
- Automated docking port, Dragon 1 has a berthing port that requires the ISS to use the CanadaArm to maneuver it in for berthing and astronauts in the ISS to make/release the connection.
From what I understand it's basically a ground up new design with a new pressure vessel. Eventually they will start using a version of Dragon 2 for cargo missions as well although supposeldy it won't have launch abort capability.
