The Bonnie and Greg tracks, together and separately, were done in sessions WAY back in Spring to Fall 2012 before she was even signed to RocNation. As such, they likely won't see the light of day. If they do, it'll be likely due to Parlophone strong-arming her A&R, now controlled mostly by Roc.
The amount of other tracks (demo or in full) recorded since the Roc signing isn't remotely as much as the infamous, leak-ridden X era, but it's pretty close - given the amount of collaborators, 50+ tracks…..easily.
The style of the tracks depends on time recorded, and are drastically different from one another...
Style 1) Recorded before Roc signing
Style 2) Post Roc, Skirt
Style 3) Post-Limpido, Change of direction, The Voice signing
Sources: The usual
They make great pop music.
I'm so excited for this album still