Was kind of bummed to read this but I suppose I knew it would happen. Apparently Lawrence Kasdan is moving on after he finishes up with the Han Solo SW Anthology film (due in 2018). So he will have co-written TFA and the Han Solo movie and bow out. I hope Rian Johnson is really as good as they say to write the middle film. For that matter, Colin Trevorrow with the final film in the ST.
http://www.slashfilm.com/star-wars-writer-lawrence-kasdan/
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The TFA spoiler thread is over there. >_<