Pepsi sells concentrate to their bottlers, not a finished syrup the way that Coke does. That gives the bottlers the option to use which sweetener they desire. However I don't think any of them use real sugar in the US anymore. But they have the option.
Actually, now that you mention it, wasn't there a post here a while back saying that new labelling laws were going into effect that would require the bottlers to state exactly what they use for sweeteners??
-andy
Give me some cane sugar Pepsi in a glass bottle!!