Spotify is coming sometime in 2016. It's not clear if this is for MY 2017 cars only.
From the UK press release:
Volvo’s in-car connectivity and driver interface system, Sensus, will receive several new native apps across the range for 2016, including Spotify and Park and Pay. Spotify, the highly popular music streaming service, provides constant access to an immense online library of your favourite music and utilises the familiar interface of Spotify’s smartphone applications in the car. Park and Pay provides Volvo owners with the ultimate convenience of finding and paying for parking when desired (the payment function is not yet offered in the UK).