According to his character description in this week's Weekly Famitsu, Holmes is, "The most famous detective in the world. His unparalleled observation and deductive skills see not only the 'truth' but sometimes go beyond the truth and become a 'rampage of logic.' He resides in London."
Where would Holmes be without his friend and companion, the young 8-year-old Watson — wait, what? Yes, in Ace Attorney, Iris Watson will be an 8-year-old genius girl. Her character description reads, "A young girl who lives with Holmes. She holds a medical Ph.D. at the age of 8, and wrote the novel series, 'The Adventures of Sherlock Holmes.'"
It is unclear as to how big a role Holmes and Watson will play in the game, but one bit of released information indicates that they will play a part in the game's new "collaborative deduction" system. It is also unclear if Holmes' nemesis will be making an appearance or not. He probably won't do drugs, though.
More information on the game will be released at this year's Tokyo Game Show.
Ace Attorney: The Adventures of Ryunosuke Naruhodou is scheduled for release in Japan on the 3DS in Q2 2015. No word on an international release.