The transition to Unreal Engine 6 will begin in 2.5 years. Which means we will see preview versions of UE6 around 2028 to 2029:
Source Unreal Fest Tokyo 2025
Epic's poll to UEFN developers asking what Visual Verse should be like:
Source Matt Workman "This Week in Unreal"
Great interview with Tim Sweeney and Neal Stephenson, the author of Snow Crash, talking about Epic's vision of the Metaverse. There he outlines the goal of a persistent universe with millions of players and different games being physical locations in the world:
https://www.matthewball.co/all/sweeneystephenson
Tim Sweeney announcement that Unity Games are coming to UEFN:
Source Unity's Channel
4 hour interview of Tim Sweeney by Lex Fridman also outlining goals with UE6 and Fortnite:
Source Lex Fridman's Channel