The Verizon iPhone, which was announcedtoday, has slightly relocated buttons.
The newlyrevisedCDMA antenna notch has pushed the volume and mute controls a bit down from the GSM version. This means that a lot of current iPhone 4 cases probably won't be an exact fit for the Verizon iPhone. However, third-party manufactures will most likely have compatible cases in stores before the February 10th launch date.
*sigh* Apple. Just another way to make sure people BUY the new phone. Had they used the same settings but modified the antenna, I would've just traded spaces with my iPhone to get the "better" reception.