Since the last Metal Gear Rising: Revengeance trailer had a whole bunch of robot dog in it, it may be safe to say we've already been introduced to that character. Either way, Konami plans to bring Platinum Games' insane actioner to this year's Tokyo Game Show, where they'll be revealing a mystery character.
TGS 2012 is creeping up quickly. The event runs September 20-23, and is open to the public on the last two days.
In more Revengeance news, the Japanese voice cast will feature Kenyuu Horiuchi returning as Raiden, with Hiroaki Hirata (Final Fantasy XII's Baltheir) as Sam, and Yoshimasa Hosoya as the aforementioned robot dog, LQ-841.
Metal Gear Rising: Revengeance is due out in North America on February 19, 2013.