https://techcrunch.com/2020/12/02/youtube-upgrades-premieres-with-trailers-themes-and-a-live-pre-show-option/

YouTube today is launching three new features designed to improve its “Premieres” experience, including trailers, themes, and live stream “pre-shows” that later redirect to the main event. Premieres, which first arrived in 2018, are designed to give creators the ability to leverage the revenue generation possibilities that come with live videos without having to actually “go live.”

Instead, Premieres allow creators to promote a scheduled video release by pointing fans to a landing page with a live chat in the sidebar, just like other live videos. This lets creators take advantage of money-making features like SuperChat, Stickers, ads, and Channel Memberships.