Hero of Legend
Member
https://twitter.com/pokken_official/status/783126672325287936?lang=en
アーケード版「ポッ拳」に新たなバトルポケモンの参戦が決定! その正体は・・・10月13日に公開予定!続報を待て!
Translation confirmed by a good friend of mine on Twitter:
indenty of new battle pokemon will be released october 13th, stay tuned
https://twitter.com/mihori_kc/status/783131544298917888
arcade version "pokken"
https://twitter.com/mihori_kc/status/783132431150944258
The Google/Bing translation says Arcade version so I'm getting that clarified. (Edit: Arcade confirmed in second tweet above)
Last time we had Darkrai. Rumors apparently point to it being one of these two:
Empoleon or Scizor.