The official Japanese Pokémon website has revealed that a Pocket Monsters Omega Ruby / Alpha Sapphire x NicoNico Live: Autumn Pokémon Special (ポケットモンスター オメガルビー・アルファサファイア × ニコニコ生放送 秋のポケモンスペシャル) will be broadcast online on October 2nd, 2014.

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Kosuke (コスケ) from AppBank will showcase the games and new information will be revealed during the broadcast.

Source: http://www.pokemon.co.jp/ex/oras_nico/