analyzingtaylor had a quote from ed saying that Taylor told him that a lead single needs to be different from pervious material, and even though it may not be the best song, it needs to get people interested and talking.. I'd bet that the Pat Benatar/Audiosave sounding song will be the lead, MM songs to follow.
Also interesting is this:
Yes, it's old, but what's interesting is that Jaime is a 35 year old woman with a child and husband. If Taylor's new music is dance, then it must have some level of maturity and sense of age so much as that Jaime would give such high approval.