MyHoYo rides the wave of the announced success of Genshin Impact, within his own blog, the next updates coming during the latter part of 2020 through early 2021. Thanks to the Reddit user silvermercurius let's discover the content of this roadmap:

official Version 1.1 update schedule and onward from Genshin_Impact

The next update (1.1), scheduled for the day November 11, 2020, will start the event "Never Returning Star Extinguishment", which he will most likely carry with him new character pools and weapons. Around Christmas, exactly the December 23 2020, version 1.2 will open the doors of the Longji Snow Mountain, the first of the new playable areas for players that will bring new activities and content. Finally, version 1.3 will kick off the event "Festival of Lights" and will be made available within February 2021.

Furthermore, the developer confirmed that each new update will be released following a 6 week interval, to give the team time to optimize and improve the gaming experience.