MTGSalvation.com Rumor Mill moderator TK-421 appears to be close to a very generous source right now - that person has agreed to be the "Oracle of Salvation," dropping obscure hints about Born of the Gods during the month of December. The December 3 Oracle of Salvation thread in the Rumor Mill makes mention of reprints and music:
Sometimes the crazies trickle in, sometimes they flood.
"As the champion stared at the satyrs playing their instrument, it reminded her of an instrument that was known to be common in the place of neverending days and nights."
Let's figure this one out!
The fact that the card being referred to is a musical instrument means it's almost certainly an artifact. "Known to be common" is the rarity of the reference card, and "the place of neverending days and nights" is the plane of Lorwyn/Shadowmoor. This means that we're looking for a common artifact from Lorwyn, Morningtide, Shadowmoor, or Eventide that is flavored as a musical instrument, and only one fits the bill - Springleaf Drum.
Of course, "the satyrs playing their instrument" could refer to either the musicians or the instrument itself, so we might see a Satyr creature with a Springleaf Drum-like ability (though it might produce more than one mana) or indeed a straight functional reprint of Springleaf Drum, flavored as Idyll Flute or something to that effect. Though the Drum didn't receive much attention in its Standard environment, it has been an effective piece of ramp in Modern decks, and in the slower Theros Limited a functional reprint of it might see a lot of play in order to get out big creatures or activate monstrosity abilities.