So I launched Spotify through BT last night before leaving work. Ran it on the drive home and on the way in this morning. No track skips (or even audio drop-outs for that matter). Granted only about 50-55 min all in between the two drives so hardly a long-term test.
Edit: Setup - iPhone 5, Spotify freebie version
.......here's a lockpick. It might come in handy if you, the master of unlocking, take it with you.