"During the Pokémon Game Show, it was announced that a brand new anime will run to coincide with Pokémon XY. This anime is called Pokémon: The Origin, features Red & Green, is based directly on the games, and is to run from October 2nd."
It's still up in the air as to whether this is a one-time special or something long, but that doesn't mean there won't be more -- The Pokémon Company may just be testing the water to see if there would be an audience for such a show, and I think there will be!
Even if it is just a one-off, that's better than nothing. :)
EDIT: We now have a trailer! The animation quality looks pretty nice.