Someone on the MacTalk.com.au forums has a logo for the new iPhone hidden within the new version of the iPhone SDK.
From the logo, it seems to show that the new iPhone wont have any major physical changes and actually to me, looks exactly the same as the 3G iPhone.
This is not the first time that a logo of the new iPhone has been found. Here is the new iPhone next to the 3G iPhone to compare.
This may not be very conclusive evidence but it is something! What do you guys think? Post away in the comments.

I don't understand what everyone is complaining about. At least you have an iPhone. I still have to use an online one like http://interactiveiphone.com So get over it and be happy with what you got.