There is no real evidence that it will be the iPhone 5 yet. As far as I know there has not been anything released to the patent office. This is usually the first evidence of a phone release. Remember this could be the announcement of the mini ipad as well.
The real change to the iPhone 5 is the addition of an LTE radio. The networks have been bracing for this release but it is unclear to anyone, except maybe the top brass, when this will happen.
Not crazy about the phone… definetly won’t catch me in a queue waiting 36 hours for its Release. Have fun piggs.