iLounge has had decent luck predicting new iOS devices recently, managing earlier this year to correctly prophesize most of the details about the new iPad (although consensus had pretty much agreed upon them already).
Now iLounge is doing the same for the iPhone 4S, and while they echo a lot of the current speculation about a thinner iPhone 5 with a longer 4-inch display, the professional renders iLounge has put together are absolutely top-notch. This would be an incredibly attractive iPhone.