TV Tokyo video confirms Tabunne, possibly another creature
Update: A silhouette has been floating around the internet, featuring a character very similar to the one shown here. The image can be seen to the right.
TV Tokyo has updated its website with a preview for a Generation V introduction special, to air September 16. The 28-second trailer revealed the revamped set for Pokémon Sunday, of which included an image of Tabunne, a Pokémon previously seen in a game screenshot and in a Pokémon Center ad, and possibly another Pokémon.
An annotated version of the image, showing the locations of the Pokémon, can be seen below.