Based on this a little speculation:
1) Magic shockwave across the island looks like the one from true love’s kiss (Emma revives a heartless Henry?)
2) Magical cardiectomy scene with Pan and Henry (Pan stealing Henry’s heart, Henry giving it up willingly/ under duress?)
3) Emma’s too late “NOOOOO!” (To stop Henry from giving up his heart?)
4) Once again w/ Emma’s help Regina their magic makes big things happen.
5) The family team is back together again.
Just have to include this since it seems to parallel what I’m seeing in the promo.
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Custodian of Graham's darts, Rumple's spindle and Robin's quiver