The ai.rs blog previously posted the specs of the HTC Leo and some of the key ones are:
It has all the other typical high end specs too, such as WiFi, Bluetooth, GPS, 3.5mm headset jack, accelerometer, etc. For comparison, the HTC Touch HD had a 528 MHz processor, WM 6.1, 3.8 inch resistive display, and 5 megapixel camera so this is a very nice upgrade.
Unfortunately, like the HTC Touch HD I highly doubt we will see this released by a US wireless carrier and there may not even be a version that supports the AT&T or T-Mobile 3G data network. There has been no official announcement yet, no release date, and no pricing.