I have the HTC EVO 3D so am pleased for once a manufacturer isn't dumping a device I bought within a month or so, as has happened in the past.
Although reading the HTC UK Facebook posting about this today, there are a lot of annoyed Desire HD owners.
ETA: The OPs link deals with HTC in the US. HTC UK revealed on its Facebook page the upgrades would be applied to the HTC Sensation (XE, XL) and HTC EVO 3D, along with a few US only phones.