HTC in China is now starting to ship the HTC Desire with Android 2.2 pre-installed along with HTC Sense.
From what Engadget heard from the company, HTC will be now shipping all HTC smartphones in China with Android 2.2 installed which includes the Wildfire and Tianyi.
It also appears that HTC will be pushing out the Android 2.2 update OTA to all phones that can use it next month meaning that anyone with a HTC smartphone capable of running it, will be running it.
We are not aware of a list yet of which HTC phones will be getting Android 2.2, but we suspect anything since the HTC Nexus One at least. We'll keep an eye on this and let you know what phones will be included soon.