how would it work
the iPhone already makes a click sound when you type a key anyway
and to be honest, i find i type faster without the sound on, because when it is there, i tend to wait a fraction of a second for the click before pressing the next key. when it's silent, i just type without any pauses.
is this suggesting that the phone will rumble each time i type a key? will there be a different rumble for each key? otherwise, what is the difference between a vibration and a key click sound?
or is it... that when you're holding your finger down on the screen and dragging it across the keyboard to get to another key - will it rumble so you can count yourself moving from key to key?
i can see how that would work - and on the odd occasion when i'm txting and driving and trying not to get arrested by the cops, it would even be slightly useful - but really, how often is anyone going to need it?