I have no proof for this, I`m maybe a little bit late. But need youre help. I think I resolved a mystery.
Have a look at an offical picture from the Apple Homepage:
![]()
Uploaded with ImageShack.us
It shows the notifications.
I make a reference to this article:
http://www.tuaw.com/2011/02/16/the-four-inch-iphone-display-doing-the-math/
(please read it, its interesting)
Apple cant force app developers to change to resolution on their apps for a few pixels. But they can use the "extra" pixels for notifactions that can come up without disturb the main application.
So how many pixels do this new notifactions use is the question?
Have a look at an offical picture from the Apple Homepage:

Uploaded with ImageShack.us
It shows the notifications.
I make a reference to this article:
http://www.tuaw.com/2011/02/16/the-four-inch-iphone-display-doing-the-math/
(please read it, its interesting)
At a 16:10 aspect ratio, Apple could keep the iPhone 4's display at 640 pixels in the portrait dimension without substantially sacrificing resolution -- it would be around 300 ppi instead of 326, which isn't much of a loss. The resolution would change to 1024 x 640. This means apps formatted for the iPhone's current 3:2 form factor would run "pillarboxed" with 32 blank pixels on either side -- at roughly 300 ppi, that works out to about 2.5 mm of blank screen on either side -- unless developers decided to program the new resolution into their apps.
Apple cant force app developers to change to resolution on their apps for a few pixels. But they can use the "extra" pixels for notifactions that can come up without disturb the main application.
So how many pixels do this new notifactions use is the question?