let's face it, non chapter content eaither means Ops, Flashpoints, or a new daily zone, (or I suppose a new PVP map but they've shown they're willing to release those already) of the three we don't NEED new daily areas, and honestly I don't think many people do flashpoints much anymore. so a new Op would be the best use of their time.
that said ultimatly the reason for the delay can likely be traced to the simple question "why cater to your smallest demographic?"