iOS 7 on iPhone 4. You won’t have;
Dynamic Wallpapers
Blurred control centre/bottom bar (they will be a transparent grey colour) 
The ability to add filters to photos in camera (you will be able to add them in the photo viewer app though) 
Some glitches in the beta so far;
Music occasionally only playing two seconds and then skipping to the next song
Having to pull up in messages to see the latest message (though that hasn’t happened in a few hours so it may be fixed)
Other than that it’s a bit slow but that’s to be expected. Though the grey instead of the blurriness is actually making me want to throw up, the old ‘platform’ type bottom bar would be better than this thick gaudy awfulness.

iOS 7 on iPhone 4.
You won’t have;

  • Dynamic Wallpapers
  • Blurred control centre/bottom bar (they will be a transparent grey colour) 
  • The ability to add filters to photos in camera (you will be able to add them in the photo viewer app though) 

Some glitches in the beta so far;

  • Music occasionally only playing two seconds and then skipping to the next song
  • Having to pull up in messages to see the latest message (though that hasn’t happened in a few hours so it may be fixed)

Other than that it’s a bit slow but that’s to be expected. Though the grey instead of the blurriness is actually making me want to throw up, the old ‘platform’ type bottom bar would be better than this thick gaudy awfulness.