the::unwired.net have published a hands-on video of the HTC 7 Pro in action. The device features the amazing keyboards we have become used to on HTC landscape sliders, appearing to utilize a very large amount of the possible surface area.
It is well know that many parts of the user interface of Windows Phone 7 do not support landscape mode. As the pictures above indicate, this can also include 3rd party applications, as the facebook app on the left demonstrates.
See the 8 minute video at the::unwired here.