The Halo TV series has been a long time in the making. Microsoft originally detailed the project alongside the announcement of the Xbox One in May 2013, with Steven Spielberg attached as an executive producer.
https://www.techspot.com/news/93193-paramount-shares-first-halo-tv-series-trailer-ahead.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/93193-paramount-shares-first-halo-tv-series-trailer-ahead.html?utm_source=dlvr.it&utm_medium=blogger