What does the BB10 UI offer that Android does not?
Go watch the videos.
Example. Playing angry birds and want to check your facebook?
Android:
Playing angry birds
close Angry Birds (loosing state)
navigate to Facebook tile
Open Facebook app (no new mesages)
play with facebook
Exit facebook
... repeat for e-mail, text mesaages, 4 square, etc ...
find angry birds tile
Launch ANgry Birds (starting new session)
Flow:
Playing angry birds
Use gesture to see if there are new messages in e-mail, facebook, etc
1 second later, back at angry birds right where you left off
Now I am sure there may be ways to do things in Facebook, e-mail, etc more efficiently. But not by default and not by the Droid OS. maybe through a 3rd party app. This is all in BB10 as part of the OS.
Now apply this to everything out there. It just works in BB10 w/ Flow. If it can be done on Droid/iOS you need to find workarounds.
I have a Droid. It works. But watching the BB10 in action, it blows my Droid away in terms of user experience. Think otherwise? It's like saying that it is easier to change CDs than use your smartphone's media player.
The videos are all out there showing off the BB10 and how it interacts with the operator. I went in with an open mind. There is a reason I own RIMM stock and call options.
2008: Old BB ..... look at how awesome this iPhone is and Droid is. Everyone moves to those platforms. And now (2012), BB10 is ready to come out and once everyone sees how good the user experience is, they obviosuly will remain loyal to iOS and Droid.