It looks like HTC is on fire with its Android 4.0 Ice Cream Sandwich updates. Following the HTC Sensation, Sensation XE and HTC Vivid, now owners of the HTC Rezound can get their hands on the official Android 4.0 Ice Cream Sandwich build, unofficially.
Official HTC Rezound Android 4.0 Ice Cream Sandwich update leaked
It seems that someone has sneaked the 640MB update out to the public and so far it appears to be in good working order. The folks over at Droid-Life have the below instructions posted in case you want to give it a shot:
After downloading the file, rename it to PH98IMG.zip; Place the renamed file onto the root of the SD Card; Power down your device; Reboot into the bootloader by holding VOL DOWN + Power; The flashing process should begin automatically.
Once it has rebooted (will take a fair amount of time), your HTC Rezound will be running on Android 4.0 Ice Cream Sandwich.