I've been keeping up to date with the development of this for about a year now because proper adventure games are lacking in the console department. The Testament of Sherlock Holmes though, (due out Q1 2012) is coming not only to PC but to PS3 and Xbox 360 too.
If you liked the detective elements of L.A. Noire you might want to read this preview, I think it's about time more games like this became available on consoles even if it is just to save me the bother of buying a proper PC.
Video: CEO of Frogwares, Wael Amr speaks to Blake about their upcoming Sherlock Holmes game making its first appearance on consoles and maybe showing the first love scene between Holmes and Watson.