I've made an altered image of the iPhone to see if there might be four more apps due from apple on the release date.
I think that the icons fit on the screen rather well though I'm not so sure that all those apps will be that great. The blank space between the apps in the main part of the screen and the four "critical" ones along the bottom (Phone, Mail, Safari and iPod) seem to separate them a bit more. With the icons that I added, it seems a bit more cluttered and hard to see.
I guess we'll see if there are any more surprises in store for us.
I used Gimp to modify the picture, which came from an iPhone image on Wikipedia.