I just fixed https://issues.jboss.org/browse/JBIDE-19345 which introduces support for conditional directives in the N&N.

From now, you can wrap some content with ifndef::finalnn[] / endif::finalnn[] for N&N items that have been outdated in subsequent versions and thus, that should not appear in the aggregated N&N page of the final release. 

 

See an example here: https://raw.githubusercontent.com/jbosstools/jbosstools-website/master/documentation/whatsnew/forge/forge-news-4.2.3.CR1.adoc : the upgrade to forge 2.15.1.Final is mentioned in the N&N of JBoss Tools 4.2.3.CR1 (which is correct) but it will be hidden in the N&N of JBoss Tools 4.2.3.Final because in the mean time, the Forge runtime has been updated to 2.15.2.Final.