User blog comment:Raylan13/Elder Scrolls Online Community Q&A/@comment-3076045-20140321065915

Can we confirm whether or not they are still sticking with the additional content every 4-6 weeks that they said late last year, or has this changed?

I would also like to ask them to proof-read their book content a bit more thoroughly - there are a few books that exist in the game from other games in the series - and several of these are impossible to have been written during the Second Era. (A few mention events of the Third Era, or the third era itself).