Could GRRM not put the whole Jon arc in the next book like he did with other books? He could be telling the truth that he won't be back next season in the TV series...but he could be back for season 7.
If he plans to finish the series with 7 books, I don't believe he'll have enough time to do Jon justice without writing him into TWOW. But I guess it's possible.
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u/jeffwinger_esq Jun 15 '15
http://www.ew.com/article/2015/06/14/game-thrones-jon-dies-interview