Just received this email today, with the following info:

http://www.lan.com/es_cl/sitio_perso...e-acumulacion/

From 01 January 2015

Deep discounted short- and long-haul economy fares are loosing:
BASE: 50% (from 100% on long-haul)
BASE PLUS: 75% (from 100% both regional and long-haul)

Premium Business is gaining (from 125% to 150%) for all flights, short- and long-haul.