WiMAX/LTE may not meet the technical definition but they are on the 4G roadmap while HSPA+ is not. WiMAX/LTE may not be superhigh speed to a single user but the infrastructure allows for handling many more users at once at a higher performance level than 3.xG.
HSPA+ is on the roadmap to 4G actually, it's called LTE-Advanced which is the evolution of HSPA+ which is the evolution of GSM technologies -- 2010 Ford Fusion Sport
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