When using an input field inside a component this becomes a really important feature - so that each instance can have its own placeholder text. In the simplest need, a pair of password creation components would ideally have placeholder text that says "Create password" and "Confirm password". I know you can fake it by having a text field that becomes opaque, but much nicer to have the placeholder get its value from a variable.

Changing placeholders would be really good! News about this?

Need some way of working with placeholder text, like on focus in/out. For example, with a material design style input, showing a hint on focus.