HTC to update back catalogue of devices to ICS within Q3
HTC has published an approximate schedule as to when its devices will be updated to Android 4.0 Ice Cream Sandwich; most are due between June and July. Some handsets such as the Sensation/XE have already had their updates start rolling out.
Currently the HTC One series handsets are the only ones that run 4.0 Ice Cream Sandwich, although the HTC Desire C is due to join them in just over a week.
View the schedule from the HTC blog after the cut. 
Image courtesy of TechIn5
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