Marvel has officially confirmed that Krysten Ritter will be playing Jessica Jones in the netflix series. I must say I'm excited about this casting Krysten Ritter was incredible as Jane in season 2 of Breaking Bad.
Nothing has been confirmed yet for the casting of Luke Cage. But all news seem to indicate that the frontrunner for the role is Mike Colter. I remember him for his minor role in the film Million Dollar Baby and I've seen him appear in several episodes of the The Good Wife. If he does land the role I think he'll be a good choice judging from what I've seen of him. He definitely looks the part and is a very good actor.