HTC have released information on when their devices will get Android 4.0 aka Ice Cream Sandwich.
The list is below with handsets available in the UK highlighted in bold
What is the overall timeline of Android 4.0 updates?
The majority of devices will receive upgrades in June and July 2012 and we expect to finish upgrades in August 2012 for all announced devices.
When will my device get the Android 4.0 upgrade?
The target timeline for announced devices is below. Because of partner and network testing, and approval processes for device updates, it can take up to 45 days for all carriers and countries to get the update after a rollout has begun.
Device
Schedule
DROID Incredible 2 by HTC To be determined (by the end of August) HTC Amaze 4G May-June HTC Desire S June-July HTC Desire HD July-August HTC EVO 3D June-July HTC EVO 4G+ May-June HTC EVO Design 4G June-July HTC Incredible S June-July HTC Sensation March-June HTC Sensation 4G March-June HTC Sensation XE March-June HTC Sensation XL April-Jun HTC Rezound June-July HTC Rhyme June-July HTC Thunderbolt July-August HTC Velocity 4G March-June HTC Vivid March-June
Please note these dates are targets and may shift due to testing and approval
Link: XDA Developers