Setting voice reminders in Android is neat, but it's one of those processes that seems arbitrarily hobbled by the need to tap a button on the screen after you're done talking. Well, no more. Google has flipped a switch on the server side that makes the process work entirely by voice.
The new behavior will ask you to confirm by voice after the notification card is generated. If you say "yes," the reminder is set and you're done. If you change your mind, just say no and you can make changes to the card and set it manually.
I've found the voice confirmation to be a little finicky, but the functionality is there. You shouldn't need to update anything to get this feature – it just works.
[Thanks, +Bora U]