Besides showing off snippets of gameplay and new starters, yesterday’s Pokémon debut trailer (has it seriously only been a day since the games were announced?) had flashes of two Legendary-looking Pokémon. Those have been confirmed to indeed be Legendary and have hard-to-pronounce names. Xereas (ZURR-nee-us) is a blue/black mythological deer with illuminated rainbow antlers and Yveltal is a luminescent bird with three claws at the end of each appendage.
Both are neat looking and should be fun to track down in October.