Today (April 14), according to the new news officially released by Re-Logic, Terraria's large-scale update "Journey's End" announced that it will land on the PC platform on May 16, 2020, and the following are the relevant details of the official release.
Screenshot of the official announcement:

Official original text:
Hello players!
Last week we mentioned something about the update at the Terraria forum, and the overall situation is currently more difficult under the world epidemic. Still, we're doing our best to get the Terraria update out as quickly as possible.
So, today I would like to take this opportunity to reveal a little bit about the large-scale update of Terraria: the theme of this update is "Journey's End", which is expected to land on the PC platform on May 16, 2020.
In the coming month, we will continue to disclose new information related to this update, and please keep an eye on it.
The major Terraria update "Journey's End" is expected to land on the PC platform on May 16, 2020, and interested players can get the Steam Marketplace link: "Links"