Hi Aimee!
Welcome back to the Disney Parks Moms Panel.
I love to use the Disney Dining Plans and it's good to be prepared with making your dining reservations in advance of your visit, or planning where you are going to use your Quick-Service credits. I have noticed that some restaurants are still being added to the 2020 Disney Dining Plan list so I would keep checking throughout January. But for now, I have good news! The three Quick-Service restaurants that you specifically mention in
Epcot's World Showcase, have already been included in the 2020 Disney Dining Plan! Namely,
Tangierine Cafe in the Morocco pavilion,
Lotus Blossom Cafe in the China pavilion and
La Cantina de San Angel in the Mexico pavilion.
I would recommend that you go ahead and make dining reservations at all your favourite locations, even if they are not yet stating that you can use your Disney Dining Plans. If the dining plans are subsequently added, then you already have your reservation in place, or if they do not add the dining plan you can change your reservations up to 24 hours before the date of your booking. Dining reservations can be made up to 180 days in advance, online, or by using My Disney Experience.
Please come back and visit us if you have any further questions. We will be happy to help you plan your magical vacation to Walt Disney World Resort.
Sue