In a statement, HTC said, "In some cases … restrictions prevent certain devices from participating in our bootloader unlocking program. HTC is committed to listening to users and delivering customer satisfaction. Since announcing our commitment to unlockable bootloaders, HTC has worked to enable our customers to unlock the bootloader on more than 45 devices over the past six months. Rest assured, HTC is committed to assisting developers in unlocking bootloaders for HTC devices and we’ll continue to unlock additional devices in the future."
By using the word "restrictions" HTC is believed to mean AT&T. If there is any good news to come from this, it certainly sounds as though HTC is still fully committed to continue unlocking bootloaders on its new devices. That is, at the discretion of each carrier, of course.