Of course we only have one year for comparison, but there is no past evidence that the iPhone's hardware is really going to get a boost. The hardware jump from the original iPhone to the 3G really wasn't much. Basically we saw a GPS chip placed in it, a 3G chip placed in, and a supposedly better battery.
Apple never reacts to its competitors, so I really don't see them panicking and throwing all this new stuff in it. The processor is technology from 2006 (that needs to be replaced with something new), more RAM (which is likely the cause of Safari crashing a lot), and then maybe more storage. That's it.
I wouldn't really be surprised if we didn't see a camera update. Apple is quarky like that. If they don't believe we should be using our cellphones as a primary camera (regardless of the customer's preference), then they won't bother to upgrade it. And all the Apple apologists on here will try to tell us how we should be using a stand-alone camera instead and we really don't need a better camera. And Steve Jobs has vision which we don't understand, blah, blah, blah. However, I can't see them rationalizing a weaker processor, less RAM, or less storage.