In this GDC 2026 session, Joe Valenzuela, Senior Director of Unity’s Core Engine team, gives a whirlwind overview of the most anticipated updates on the roadmap. From CoreCLR to the massive shift of ECS For All, find out how these changes will redefine performance and workflow for every developer.

Read more: https://on.unity.com/Discussions_CoreEngine26

[00:00] Intro
[01:11] CoreCLR
[09:26] Serialization (and CoreCLR)
[11:34] Entities Integration
[18:35] Wrap-up

#Unity #Unity64 #CoreCLR #UnityEngine #GDC26

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Unity

Unity's core engine team plans to replace the Mono scripting runtime with CoreCLR in Unity 6.8, shipping in 2026. Key milestones include: Unity 6.5 introducing new lifecycle APIs, Unity 6.6 making Fast Enter Play Mode the default for new projects, Unity 6.7 LTS offering an experimental CoreCLR desktop player, and Unity 6.8 alpha dropping Mono entirely. CoreCLR brings a modern garbage collector, improved JIT compiler, .NET 10 base class library, and C# 14 language features. The transition also involves API deprecations (e.g., BinaryFormatter removal), changes to assembly loading via AssemblyLoadContext, serialization system updates including C# Dictionary support, and deep ECS integration (Entities Integration / ECS for All) that unifies GameObjects and Entities through 64-bit instance IDs, unified transforms, and a new Hierarchy v2 window.

Path to CoreCLR | GDC 2026