Recent Changes questions

Re: http://wiki.netbeans.org/RubyRecentChanges

I don't see any activity after June 5. Should I look elsewhere to learn 
about 6.5 changes (in addition to New & Noteworthy and the Mercurial 
browser)? I just want to make sure I know about all the changes so that 
I can document them.

In regards to " Semantic Highlighting: Code rewritten; should be more 
efficient, some range bugs fixed. Tooltips on unused ranges." What is 
meant by "Tooltips on unused ranges"? I don't understand what that means.