The next version of Unity will be called Unity 6

gamedeveloper.com:

Today at Unite 2023 in Amsterdam, Unity unveiled new details on what it is now calling Unity 6—the next version of the game engine software that will be available in 2024. Starting with this version, Unity is shifting to a number-based naming convention, moving away from the "LTS" (Long Term Support) naming format, which also listed the year that version of the software was developed in.

Unity 6 will contain a number of software and quality-of-life updates like the debut of Unity Cloud. Most notably it will include the early access rollout of Unity's two major generative AI tools: Unity Muse and Unity Sentis. Muse is an AI content creation tool that allows developers to create assets and animations "faster, without interrupting their workflows." Unity Sentis is a runtime inference engine that allows developers to integrate neural networks in their game "on any platform."

Developers are likely to be keenly interested in what benefits Unity 6 has to offer since this will be the first version of the software that will charge high-earning developers a fee based on either "initial engagements" by players or a percentage of their revenue, whichever is lower. The structure of this fee program was introduced after an initial install-based Runtime Fee was roundly rejected by the developer community.

Unity Create president Marc Whitten—who both made the case for the Runtime Fee and was the public face of Unity's apology over its rollout—explained to Game Developer that the move to a number-based naming system is meant to communicate to developers precisely which version of Unity they are operating on, and which versions of the software will require developers to pay the revenue fee.

It's Unity's first step into a world where it will