http://www.techradar.com/news/invoke-cortana-powered-speaker-release-date-news-and-rumors

Update: Harman Kardon has finally lifted the curtain on its Cortana smart speaker – we now know the Invoke's release date (October 22) and final price ($199). 

We have an Invoke review unit of our own that we've been testing and will have a review live on the site shortly.