I think they changed Belong vibe to suit with the album. It'll probably be more dancey/electro than folky... Since they scrapped every folky song! (Outlaw, Chasing The Sun, All About You...) i don't get why to include Belong unless - as i think - they haven't remastered it.
But that's just my opinion
Outlaw sounds like would have clearly blended with Sparks and also AAY probably would aswell as Brave Heart and Tattoo have those folky guitars on them, but we havent heard the album so
Imagine if she released like an 8 track EP of the dark-edm songs she made in 2013, around early 2014 (Hurts & Better Days became the singles)
Then release AAY as lead single in August (gain that 35M views that Cursing The Sun got), then drop a 17-track folk-pop This Heart in October (when it was supposedly meant to be released) and promoted the hell out of it (imagine Younger was out of picture)
Then in April 2015 announce a new album to be released exactly a year apart and that's BIBO. Release Sparks in July and promote the hell out of it again and then watch her being hailed The Comeback Princess!
Anyways excited for BIBO!!!
This is EXACTLY what needed to happen. Thought about this weeks ago!