On someone else to cover it:

http://www.techvibes.com/blog/what-makes-blackberry-distinct-from-ios-and-android-2012-11-22

Here is what I get from the article.

RIM is going in a totally different direction than Android and iOS with Blackberry 10. They're copying Microsoft Windows Phone 8, instead and trying to get away from the "app-centric" approach to mobile devices.

I'm not sure how that can go much better for RIM than it has gone for Microsoft.