When iOS 9 came out for iPad and iPhone, the default appearance of the keyboard changed. The Mrs is visually challenged and did not like the new look of the keyboard. She wanted the old one back. The difference is that the old keyboard displayed CAPITAL LETTERS all of the time. The new one displays either lowercase or UPPERCASE depending on whether or not the shift key was depressed.

OLD KEYBOARD

 
New Keyboard 

Although not obvious it is possible to revert to the old keyboard default as follows:

Settings > General > Accessibility > Keyboard > Show Lowercase Keys 

Toggle Show Lowecase Keys off

 
Let me know in the comments below if this was useful to you …