For mobiles.co.uk is a fact that HTC Vision will be named HTC Desire Z. The phone is described as an Android 2.1 device (yes, 2.1, not 2.2) with a full sliding keyboard.
Regarding the Desire HD, they say that is a Froyo device equipped with a 4.3-inch display, 1GHz core, 8 megapixel camera with 720p video capture, and 4GB of internal storage.
(Source: engadget)
Tags: 720p, Desire HD, Desire Z, Froyo, mobiles.co.uk, Vision