MacRumors happened upon some code in the new SDK which seems to reveal that a new iPhone is coming in June. While this news isn't really unexpected, it is the first signs we are seeing that the iPhones are going to be upgraded (what? you thought Apple was going to discontinue them?).
On a seperate note they also got a screengrab from a web hits vendor that shows that someone with one of these new iPhones has been browsing the web - or that someone has been spoofing for fun and profit.
The news is similar to the December news that new Mac Mini and iMac graphics drivers were found in the most recent versions of Leopard.