The iFixyouri and 9to5mac tear down Verizon iPhone 4, and they report that "the new Verizon iPhone has a dualmode GSM and CDMA chipset. Although the Verizon iPhone doesn't have a SIM slot, it does appear that the iPhone 5 could have one model for both GSM and CDMA carriers, both inside and outside of the US."
The chipset, Qualcomm MDM6600, supports HSPA+ up to 14.4 Mbps. Even though Verizon uses a different technology, the hardware gives us a possible glimpse into the future of the iPhone. Many carriers within the United States, including AT&T, support HSPA+ already.
Since the new Qualcomm chipset supports both GSM and CDMA, why wouldn't Apple use this technology in the upcoming iPad 2?
MDM6600: supports HSPA+ data rates of up to 14.4 Mbps and CDMA2000 1xEV-DO Rev. A/Rev. B