Hi everyone,
We're planning to deploy Lua to a long list of wikis on Monday, February 18, 23:00-01:00 UTC (stretching into Tuesday UTC), including English Wikipedia.
Details here: http://meta.wikimedia.org/wiki/Lua
Jan Kučera (User:Kozuch) has placed notifications on many of the wikis. Those notifications and general communications listed here: http://en.wikipedia.org/wiki/User:Kozuch/Lua
This is a really exciting deployment for the projects. We're really looking forward to seeing the great things that people do with this, and looking forward to making editing and previewing more responsive for template-heavy pages.
Rob