Nintedo announced in a video today that due to their current progress on Metriod Prime 4 not meeting the quality standards they have for Metroid Prime, the development of the game is being restarted from ground zero and Nintendo is bringing on Retro Studios, developers of the first three Metroid Prime games, as the developers. This restart means that Metroid Prime 4 will in all likelihood not be released in 2019. On the other hand this restart and the bringing on of the team that made the rest of the Metriod Prime games, is a good sign that Metroid Prime 4 will meet the standards set by the previous entries in the series.