So HTC has made it clear what of their device is getting the update and they have also recently given the schedule on what phone is getting the update but that’s not the only thing they have they clarified. HTC has also made it clear what HTC phone is not getting the Android 4.0 Ice Cream Sandwich update.
We work hard to ensure each of our products has the optimal user experience and therefore some products will remain at their current version of Android. In general, devices with 512MB ROM or less will not be upgraded to Android 4.0. These devices include the HTC ChaCha, HTC Salsa, HTC Wildfire S, HTC Explorer, and others.
HTC tablets, including the HTC Flyer, HTC EVO View 4G, and HTC Jetstream, will remain on their current Android version (Honeycomb).
Upgrades are not the same thing as ongoing support. Devices not being upgraded to Android 4.0 will still get software improvements, security fixes, and technical support as needed.