Might as well get these going, though I guess as a prediction this is pretty safe and obvious:
Taylor Swift joins Pistol Annies, who incorporate dance steps, harmonies, and raps using Bell Biv DeVoe/Backstreet Boys as template, w/
Big Bang and
Danity Kane as modern analogues but Big-&-Rich tight country harmonies mixing with the R&B. Most parts are sung but brief raps are interjected and there's always a rap break prior to or as the middle eight. Rap styles are developed from each individual Annie's speaking style, as Taylor did on "
Lose Yourself" -
Teena Marie the model for keeping raps in the singer-songwriter ethos. Chapman-Shanks-Liddell-pop-rock-style production abandoned; Teddy Park and Shinsadong Tiger called in to produce and co-write.