Yes I have it.
The standalone version has no new features only camera raw updates and bug fixes. Still I’m happy the book page templates now have the missing scroll bar. That affected Windows only users.
In addition to camera raw updates and bug fixes there is a performance improvement in the Develop module for Lr 6.6 users. See this for details: What's new in Lightroom CC 2015.6 and Lightroom 6.6? | The Lightroom Queen