2ch posted a list with the Va's from the upcoming OVA:
Oga Tatsumi:
Konoshi Katsuyuki
Baby Beel:
Miyuki Sawashiro
Hilda:
Shizuka Itou
Furuichi Takayuki:
Takahiro MIZUSHIMA
Aoi Kunieda:
Aki Toyosaki
Natsume Shintaroo:
Daisuke Ono
Tojou hidetora:
Tomakazu Seki
Kanzaki Hajime:
Tomakazu Sukita
Himekawa Tatsuya:Hagino Seiroo
Alain delon:
Wataru Takagi
Demon King:
Hiroko Takahashi
From NF