LuaTeX 1.0.0 has been released and is now available in the MiKTeX "Next" repository.

The regular (stable) MiKTeX repositories will receive the new LuaTeX later this month.

What's new?

LuaTeX now supports the E command in the interactive error menu. If you don't want to use the standard editor (TeXworks), you have the option to configure another editor. See this HOWTO, for details.