In the press room at MIX, Senior Game Platform Strategist for the Xbox team, Andre Vrignaud, gave Neowin a little "hands off" demo. He answered a few questions about the interface and overall functionality. He covered phone calls, music, and the UI, among other basic things.
The video has some blurry moments due to the poor lighting, but all-in-all, it's a nice little overview of things. The phone, which is a development model that will not be released, looks amazing in person. The screen is vibrant, bright, and big. Videos don't do it justice, but unfortunately, that's all you get for now. Since all WP7S devices must have similar sized screens, we can expect some gorgeous devices in the near future.