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.
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/