"8 new Pokémon-EX including 4 full-card art Pokémon!" pretty clearly means the full art cards are Pokemon-EX...
I expect that like with almost all "English-exclusive" Pokemon cards (excluding Dark Raichu and alternate arts from Call of Legends, and possibly the cards from Power Keepers) are taken from future Japanese sets rather than created for the English. If there is no intention for Moltres and Zapdos to get full-arts in Japan, this would explain why we wouldn't be getting them. Just having looked at the Pokemon-EX, Moltres and Zapdos don't seem to have been created with competitive use in mind. I get the feeling they don't intend on reprinting them.