According to the PlayStationblog, Spotify will be available for download today on both the PlayStation 4 and the PlayStation 3.
You will not need a PlayStation Plus account to access Spotify, nor will you have to be a Spotify Premium member. Unfortunately though only PS4 users will be able to listen to their favorite playlists while playing a game.
To make things simpler, you will be able to manage your playlists using Spotify Connect, the official Spotify IOS/Android app.
The partnership is being described as “exclusive” meaning Xbox consoles will not be seeing Spotify anytime soon.