I've seen some pretty interesting speculation, since the games are titled after characters from the Roman Alphabet, that Xerneas and Yveltal may be inspired not by Norse Legends, but Greco-Roman Legends. One I particularly like is that Xerneas is linked to Diana the Moon Goddess, since it has sort of a "celestial" glow to it and Diana was often represented by a deer, whereas Yveltal is her brother, Apollo, linked to the sun (which we see behind Yveltal in the trailer), and one of the many birds that symbolize Apollo, perhaps even the Griffin given the lion-like mane and claws. With that being said, I'd like to see perhaps other Legendaries based on Greek/Roman mythos.
If they're based on the animals associated with the Olympians, it'd be:
Zeus: Eagle or Bull
Hera: Eagle, Peacock, or Lioness
Bacchus: Cat or Goat
Poiseidon: Bull, Dolphin, or Horse - but more than likely a Hippocampus to cover all the bases.
Demeter: Pig or Winged Serpent
Athena: Owl
Hestia: Donkey
Ares: Dragon, Vulture, or Boar
Aphrodite: Dove, Bee, or Swan
Hephaestus: Donkey
Hermes: Rooster, Stork, Satyr, or Tortoise
Hades: Cerebus (Duh)
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