LuaTeX 1.07.0 is now available in the MiKTeX distribution. It comes in two variants:

  • the classic LuaTeX engine with Lua 5.2
  • the experimental LuaTeX engine with Lua 5.3

If you are a script developer, you might want to give the 5.3 engine, also known as luatex53, a try.

Switching the engines is very easy. It only requires two initexmf invocations:

initexmf --set-config-value [luatex]luaver=5.3
initexmf --force --mklinks

See this HOWTO, for details.