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We don't have an exact date just yet, but according to HTC, Ice Cream Sandwich is coming in "early 2012" to the following devices: HTC Sensation, HTC Sensation XL, HTC Sensation XE and HTC Rezound.
HTC Vivid is already upgradeable to Ice Cream Sandwich, says HTC.
Furthermore, the HTC EVO 3D, HTC EVO Design 4G and HTC Amaze 4G will be upgraded through "close integration" with HTC's carrier partners.