LA Times: So are those heritage turkeys worth the extra bucks?
Cook's Illustrated suggests breaking the turkey apart to allow for uneven cooking. That could be true for a heritage bird or a typical broad breasted white. It is basically dismembering vs. splatchcocking.
EBL: Spatchcock That Turkey
Eater: How to carve your Turkey & No
Serious Eats: Grilled Spatchcocked Turkey
Lem's Place: Wine and Dine Your Turkey and Turkey Broth