I haven't seen much, just a few screenshots in GameInformer, and this trailer (http://gonintendo.com/?p=58788), but it seems like a neat game if only because I've adored Cing's other offerings (Trace Memory, Hotel Dusk).

Here's a preview (http://ds.ign.com/articles/918/918014p1.html?RSSwhen2008-10-09_073600&RSSid=918014), but basically you play as a detective who has the ability to see the past as you investigate crime scenes for differences between it and the present day.