I went back to the Crackberry.com review they did and found this bit. BlackBerry 9000 Smartphone Review - Part III - OS4.6 | CrackBerry.com The other major visual improvement to 4.6 is the treatment of layers, and more specifically, the use of transparency within the Precision themes. Open your email, and hit the menu key – as you scroll through options on the pop-up menu, you can still see through to the images behind. These transparent windows are even at work on home screen and icon screen, if for example you pull up Profiles or Connections (note the 2G/3G/2G&3G selection under Manage Connections > Mobile Network Options).
So we will have the ability to select Edge Only, 3G Only and Edge/3G depending on your area. This way we won't constantly bounce up and down on spotty 3G coverage.