User blog comment:Ktrfgfg/Chapter 53 Predictions + Volume12Special/@comment-121.215.25.251-20131223133631

Well I just hope that they do address the fact in the first part of the manga, where  we see mikasa with short hair saying 'see you later' to eren (i presume), then eren waking up, commenting that mikasa's hair has gotten longer and was suddenly crying from the dream or from something else.