Some are awful, some are amazing. Yes, the DS has precisely one gazillion "concept" models floating around the place, from fans who want their own particular quirks included with the inevitablepossible redesign of the handheld. Nintendo Power has featured this image with an advertisement for Disgaea DS and Rhapsody: A Musical Adventure, and although it looks pretty cool, it's extraordinarily doubtful that one of the most talked-about rumors in the history of the DS has just awkwardly been confirmed via this image. Bogus, but neat!
It's pretty much the same thing as the DS Lite now, only with bigger screens. Which is more or less exactly what the DS needs -- the rest is spot on. The fact that the bottom screen is misaligned with the top screen lends evidence to some guy taking one too many coffee breaks during his Photoshop training. Looks rad, not official -- redesign will probably come soon anyway. Watch this space for all E3 Nintendo revelations!
Update: Just as we thought, Nintendo denied that this widescreen DS is a representation of a new unit, stating this is "purely rumor and speculation."