Square-Enix will only confirm to GTN the following: “'Murdered: Soul Suspect' is an exciting new game from Square Enix which challenges players to solve possibly the hardest case of all.”
The company also pointed us to this website, Murdered.com. There’s little on the website other than a link to this Twitter account. The domain, not surprisingly (considering it's not a rare term), was registered way back in 2000, and was very recently updated. Due to the time lapse, it's likely that Square-Enix acquired it from another holder; it's currently registered not to Square-Enix, but to CSC Corporate Domains, Inc.
What is Murdered: Soul Suspect? I have no idea. What do you think?