It turns out the HTC Rezound wasn’t an anomly when it was discovered that HTC’s official bootloader unlock tool worked with little effort. HTC has updated the page to announce that all handsets released since September of this year are now unlockable via the method provided at HTCDev.com.
“All HTC Android devices launched after September 2011 are unlockable. The website will be updated accordingly to reflect this in the coming weeks. We continue to work on models launched prior to September 2011, please check back often for the status of older devices.”