As of yet, there isn’t a whole lot to see yet. The twitter page hosts two tweets, one being the teaser and another being a sketch of 2B herself. However the website gives us a blog post that provides a confirmation for the choice to animate. Mostly the post talks about the plot of Nier Automata but includes where the announcement came from.
“The popular action RPG game “NieR: Automata”, which was released by Square Enix on February 23, 2017 and has sold over 6 million units worldwide. We announced the decision to make a TV animation in “NieR: Automata 5th Anniversary Live Broadcast” which was delivered today, just 5 years after its release.” Says the website’s blog post.