These are chat archives for BSData/wh40k
Can I choose to use the rules and/or points for units from my index instead of the new ones in the codex once released?
In your own games, if you and your opponent agree, you can, of course, play with whatever rules you like.
In all future publications and official events though, it will be assumed that you’re using the most recent rules and Datasheets. It will also be assumed that you’re using the most up to date points for matched play, in this case, those included in the codex.