It looks pretty much the same as the icon for the iPhone 3G.
iPhone 2,1 is Apple's internal number for the next gen iPhone, expected to be announced at WWDC. The original iPhone 2G is iPhone 1,1, while the iPhone 3G is iPhone 1,2. The numbers show that even Apple doesn't consider there to be much more than a point difference between the first two iPhone generations (as opposed to the iPod touch, which went to 2,1 last fall).
The use of iPhone 2,1 led many to believe the next gen iPhone would have more differences than the addition of 3G and GPS last time around. And while it still might, including processor bumps, digital compass, a better camera, etc. if this icon is accurate it looks like few if anything will change on the outside.