It would be good to have javadoc able to generate a top level index/summary page, listing elements with specific/recent `@since` entries.

The set of `@since` values could reasonably be specified by a command line option, and for JDK documentation, could reasonably be set to the set of supported releases. (i.e. not all the way back to JDK 1.0!)

The elements could be listed in a "standard" tabbed table, allowing easy access to the elements added in the various releases.

The page could/should be added to and linked from the list of other summary pages at the top of the A-Z index page.
The page could (??) be linked from any presentation of associated `@since` values. For example, if a class has `@since 10`, the page for the class will have `Since: \n 10` ... the 10 could be linked to the "10" section of the proposed new page.