It's yet to be said if the new iPhone uses a different wattage than the previous ones. Like with the iPad -- you have to use the special iPad 10w power adapter to charge the iPad. The iPhone power brick won't work, not enough wattage. And you can't even charge the iPad on a pre-2009 Mac with USB2. Only 2009 or later model Macs can charge the iPad.
There's so much fail here I don't know where to start. You do NOT need to use the 10w iPad adapter to charge the iPad, it can charge from anything that provides a handshake and 5V current over USB.
Standard USB ports (2.5W): charges at 1/4 the rate of the iPad charger when screen is off, does not charge when screen is on.
High-power "USB charging ports" (5W): charges at 1/2 the rate of the iPad charger when screen is off, 1/4 rate when screen on.
iPhone power adapter (5W): Same as above.
iPad power adapter (10W): Full-speed charging with screen off, 3/4 speed with screen on.
Now there ARE some "dumb" chargers that are incompatible with the iPad (and every other iThing) because they just provide voltage through the port, and do not handshake with the device like a computer would. I have two such chargers. They work great with most devices that charge over USB (Droid, RAZR, Blackberry, speakerphone, PS3 controllers, etc), but not my iPhone, because it requires a little more intelligence on the other end of the cable. But anything with a USB port that has an apple logo, and most things that don't, will charge an iPad or iPhone just fine.