New special Code-completion within instantiated template classes.
This means you can jump into a template-class, see the actual types/values of all template-dependent types, and get code-completion on them.

To activate this, you current have to jump to the specialized declaration using the quickopen shortcut "CTRL+.".

Soon also to work with use-building and the context-browser, also this will get a little UI to change the template parameters while you're in a template.