One change coming to iOS 9 – currently in beta – is the appearance of lowercase keys on the keyboard when the Shift key is not engaged. Many people like this, but I find it confusing.
However, you can turn this off, and display only uppercase keys, regardless of whether you’ve tapped the Shift key. To do this, go to Settings > General > Accessibility > Keyboard, and toggle off Show Lowercase Keys.
You’ll now only see uppercase keys.