The WETA promos are, I think, standard and expanded legal. Not movie block, and not any one of the respective blocks.
Similarly, EME DDB is standard and expanded, as is The Wraith Collection, and Age's End, but they aren't a part of any block. Reflections is legal in Movie Block, Standard and Expanded, but not King Block.
And if a promo has a corresponding card in a given set, it follows the rules for the original card.