Seems like they are having some trouble with this production. They've dropped the original two directors as they were making it too much of a comedy and drifting it away from a traditional Star Wars film. Personally, I'm not against that move - Han Solo had great lines throughout his Star Wars career, but we wasn't a comic. He was cynical and sarcastic which made him funny, but he wasn't funny for funny's sake if you know what I mean.
That said, they've announced Ron Howard is taking over directorship which will be interesting too. I wonder if they've now gone too far the other way from their vision. We'll have to wait and see next year!