Specs: Moto G 4g XT 1040, Android Lollipop 5.01.
Bluetooth headset Motorola S03 paired, and set as trusted (bypasses lock screen PIN prompt when connected). Spotify Premium.

Latest update wakes my phone and bypasses the lock screen when playing "next song".
If this happens in my pocket, random taps on whatever notifications in the lock screen occur (for example, a gibberish reply to whatever new e-mail arrives).
If there was an option to keep Spotify from waking the screen up, it would be appreciated. When this changed, it's uncertain, but I didn't detect it before...