AT&T's Mango lineup announced; Current phones to get update

AT&T has just announced their plans for the fall lineup of Mango Windows Phones. First in the line up is an updated Samsung Focus. Now known as the Focus S, this bad boy will feature a 4.3 inch Super AMOLED Plus display, 8MP back camera, and a nice 1.3MP front one. Of course, the most important thing is baby is the processor, and that will be 1.4GHz. Thats the same processor that we saw on the never-existed Pre3. Next comes a lower end model known as the Focus Flash. It will have a 3.7 inch SAMOLED display, 1.4GHz processor and 5MP front and back cameras.
AT&T also says that all the current Windows Phone's on the market will get the Mango update 'this fall'

What do you think? Do you think Mango has a shot in this market? Or does Android and iOS rule this market too much?