We plan to make Zed extensible via WebAssembly, but we're taking a different approach than we did with Atom.
Our goal is to make Zed fast, stable, and collaborative first, extensible second. We'll be taking a more conservative approach with our APIs to ensure we can preserve our core values even as users add extensions.
Our goal is for Zed to have the lightweight and snappy vibe of Sublime with the power of a more full-featured IDE. These objectives are obviously in tension, but I think we can build something that balances them well. A collaborative IDE that feels fast and powerful.