[Dylflon]

I've noticed that this season is following the structure of the first season in terms of who gets an episode centered around them in what order.

1st Season: Jack - Kate - Locke - Jack --> Sun/Jin

6th Season: Jack - Kate - Locke - Jack


If I'm right, next episode will be about Jin and or Sun. Also, the episodes seem to deal with themes from those episodes in the first season.
For example, this ep in Season one was about Jack's issues with his father which now play out as issues with his kid He references how he followed his dad and found the caves which happened in the correlating first season episode.