LTE (or its official name 3GPP LTE (Long Term Evolution) - definition at wikipeidia).
From the same article:
Verizon Wireless and Vodafone Group plc shocked some in the industry when the companies announced they were considering LTE as the 4G evolution path for their respective networks. However, neither company has yet fully committed to the technology.
Many still expect Vodafone partner company and CDMA operator Verizon Wireless to eventually select Ultra Mobile Broadband (UMB) technology, which stands on the CDMA evolution path, and is often touted as an alternative to LTE technology, which is the WCDMA evolution path.