Capsule had problems after separation. Sounds like the solar panels didn't deploy. They issued a "passive abort" and cut the feed at that point. Press conference in an hour or two. When they lost communication was when the solar panels should have been deployed, so I think it's going to be something about that. I think the Dragon Capsule can still berth with the ISS even if that part fails, using backup systems, but I'm not sure. Will have to wait for the press conference I guess but it doesn't sound "ideal".

EDIT: Elon Musk himself just tweeted... "Issue with Dragon thruster pods. System inhibiting three of four from initializing. About to command inhibit override."

EDIT2: Resolved the issue with one of the thrusters needed for burn. Solar array deployed, burning for ISS now. Mission is back on track and successful. Will work on slowly bringing the other two thrusters online. Source: Elon Musk is tweeting about all of the events as they unfold.

EDIT3: Mission still in limbo, thruster issues are still quetionable. They have what they need to burn for ISS but not enough to berth with ISS. So who knows... :(