Right off the bat, the UI is going to be different with rotating banners on the home page. BlackBerry users will be able to store all of their apps digitally in a file called "My World" which allows them to move apps wirelessly from their current BlackBerry model to the next one purchased. If an app is accidentally deleted, it can be recovered from the file. Apps can be paid for through a PayPal account, major credit cards, or from the carrier's monthly invoice.
For BlackBerry users, this is another big move by RIM to try to level the playing field with Apple and Android. We're curious to see if all of the recent changes coming from RIM is enough to attract the developers that App World needs to make the Android Market look over its shoulder.
source: N4BB via MobileSyrup