In beta 2 Reminders functionality has been changed to revert in part to the old iOS 6 Reminders, for the worse IMO:
When entering a reminder:
Beta 1 - when / where / who links appeared above the keyboard giving fast access to, for example, a date / time picker.
Beta 2: the only way to add meta-information to a reminder is by tapping an i icon, through to the same crowded sheet as old reminders, where another tap is required to open the date or geofence picker. A step back.
Other changes
The list of lists doesn't show a sneak preview of reminders in any list any more, just says how many reminders are in the list.
The smart-list that only shows Scheduled reminders from all lists is no longer listed in the list list. List. It's accessed from an Alarm icon at the top right instead.
It's been swapped with the New List feature, which was previously accessed by a + in the top right. It is now a persistent faux-list appearing at the top of the list list, tapping on which creates a blank list.
Reminders notifications appear with the check circle taking the colour that you assigned to the list it comes from. Neat.