Most of the website/system integration is pending of the booking system unification... That is a milestone that requires coordinating agendas between LAN, TAM, Sabre and Amadeus, so when any delays are found, the dates are usually moved quite a bit (6 months at a time).

The most recent scheduling for this change (current as of Feb 2017), may or may not be scheduled for Q2 2018 and it may or may not get moved again. Can't confirm nor deny to protect my sources