It appears we are going to be getting a fix for the keyword problem Chaos groups are having with Imperial Armour: Index-Forces of Chaos. The problem being that armies like the World Eaters, Thousand Sons, Death Guard, and Emperors Children not being able to use units in the new index.
via a reader on Faeit 212
I sent a query to forgeworld regarding the issues with chaos legions such
as thousand sons not being able to use any forgeworld items due to
restrictions in the main chaos index this is the response
Thanks for the email. The thousand sons have access to nearly everything.our rules team have given us an official response regarding the key wordstructure.
Units in Imperial Armour - Index: Forces of Chaos with the keywordfollow the rules for using the keyword presented in Index: Chaos,and units with the keyword follow the rules for using the keyword also presented in Index: Chaos.
In addition, all units in Imperial Armour - Index: Forces of Chaos with the keywordare added to the lists of available datasheets for World Eaters, ThousandSons, Death Guard, and Emperors Children.This will be updated in future publications.