It’s a time commitment, no doubt. But if you REALLY want to know more about Windows Phone 7, MSDN posted a 22-minute tour with Joe Belfiore (VP of Windows Phone Program Management) explaining each of the features.
If this is a bit too much, you can get a good feel of WP7 in motion here, too. [MSDN]
https://gizmodo.com/windows-phone-7-first-videos-5471970
