Well, on iPhone this pretty much consist only of the letters showing in caps when you've pressed shift or caps lock. I know, I know...Android has had it for eons. And I'm the first to admit that Swype on my Note 3 destroys anything an iPhone can do in terms of text input.
But, I find that this particular addition really does away with one of my biggest annoyances with the iPhone keyboard. And since I'm getting quite used to it after one year of iPhone as daily driver (had a two year break when I used 100% Android), this improvement means that the iPhone keyboard is finally getting...closer to actually acceptable (and almost enjoyable to use
).
A second keyboard improvement that I thought of here although it's iPad exclusive is the two finger cursor move. This one is actually incredibly good, which was a total surprise to me. The iPad has never quite worked for me for real productivity tasks, but with the cursor thing I'm really enjoying it and making the effort to learn how to type fast on it. Finding that again, this typing experience is getting damn close to really acceptable...
Edit: and the new font really makes the iPhone keyboard much nicer to use for me, the letters really stand out much clearer now IMO.