As noted by Nokialino and others, Nokia has a page dedicated to the attractions of Symbian Belle, including a number of well done videos (one is embedded below). Each of the three new smartphones are featured in detail and there's even a shout out to the likes of the N8, C7 and E7 as being fully Symbian Belle compatible, with the update to come 'later'.

Update: This Nokia mini-site is not new. The page went live on August 24th, the day that Symbian Belle was announced, but it still represents a good summary of the latest software update for Symbian.

From the Nokia page:

"There are a host of exciting features packed into our hot new range of smartphones. Nokia 600, 700 and 701 offer something for everyone. But if you’d like to see which phone is best suited to you, take a look at our gallery of feature videos below."

Here's the best video, looking at Belle in overview: