The wording throws me off because I can't tell if they're actually hinting to a surprise release or the return of a star being the first big release of Q1
the latter is obviously is Ed, but if it's not him they're talking about, my top 3 guesses would be (in order)
Katy
Lorde (since she is performing at Coachella, I would expect some new material before then
)
Nicki (although I feel she's gonna change her direction since she just confirmed the breakup with Meek)
