To reproduce, just run an install from any F21 installer image, and when you get to the package install stage, open the root password hub and start typing. result: nada - the first of the password entry text boxes is not default selected. You have to click on or tab to it before you start typing.
In Fedora 20, it was selected as soon as you entered the spoke - you could just enter the spoke and start typing. (Yes, it really was: I just tested this to make sure.)
The same applies to the "User Creation" spoke; in F20 the first text entry field is default focused when you enter the spoke, in current F21 images it is not.