Not sure how accurate but came across this on Xbox Reddit. Quotes a 'source within EA', but statements don't seem to be too implausible to be real.
https://www.reddit.com/r/xboxone/comments/bpcgw2/anthem_is_coming_to_ea_access_and_free_to_play_is/
https://www.reddit.com/r/xboxone/comments/bpcgw2/anthem_is_coming_to_ea_access_and_free_to_play_is/