Lucee 5.x is now officially supported -- because the Clojure integration, introduced in FW/1 3.5, is no longer included in FW/1. You can still use cfmljure for that if you want.
Enhancements include: session scope is now pluggable; a new
missingview configuration option; a new
onReload() extension point; and more.
For the full list of enhancements and bug fixes, read the FW/1 4.1.0 Change Log.