Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
You see, it creates a little problem for apple known as "Fragmentation" which is kind of boogeyman for Apple. From the original iPad to the new iPad the ratio is still 4:3 and from original iPhone to current 4S, the ratio is 2:3.
They won't be changing the screen ratio this time.

Just noticed this reply. Looks like I was pretty much spot on with the iPhone screen size then :)
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.