Demand for the Magic Kingdom's Be Our Guest Restaurant shows no sign of wavering, and Disney has now implemented a new standby line policy during lunch.
Guests arriving for lunch without a FastPass+ reservation are now given a timed ticket, similar to the old FASTPASS system, and asked to return to the restaurant at that time. Once all the return times have been given out, a sign is posted that no more standby guests will be admitted.
The FasPass+ reservations for lunch at Be Our Guest are only available to Walt Disney World Resort hotel guests, so this new policy means that non-resort guests must arrive early to obtain a ticket, or dine elsewhere.
Dinner continues to be table service with reservations, and is not affected by the new policy. No word on if the change will be permanent - Be Our Guest has implemented a number of systems since opening, so is subject to change at any time.
Thanks to @mm522 on our forums for the information.
Guests in line for Be Our Guest Restaurant prior to the change