Update: TV Tokyo has also posted their Best Wishes mini-site, which includes a few new clips of the starters, as well as one of Reshiram. Additionally, anime artworks of Iris, Dento, the starters, Reshiram and Zekrom are available. Also included are short blurbs about Iris and Dento.
Iris: "Iris is wild-acting girl who likes to climb trees and chew berries. For some reason, she's travelling with her friend, the dragon type Pokémon Kibago."
Dento: "With an abundance of knowledge and experience, Dento is a "Pokémon Sommelier", who checks ("diagnoses") the compatibility between a trainer and their Pokémon, gives them advice on how to become better friends. Is the actual condition what is expected?"