This is not a very encouraging prospect considering Google officially introduced ICS last October.
But this is not an issue with HTC phones exclusively.
Phones with ICS upgrades rolling out now
These smartphones are already being upgraded to Android 4.0.

Samsung is not giving out any dates whatsoever.
Making matters worst neither Samsung nor carriers aresharing a timeframe for the update.
It’s unclear if this will result in any issues or missing features.
There are many new features to be gained in the transition from Gingerbread to Ice Cream Sandwich.