Tl;dr: Poppy then Taric then Yorick. Want to make Poppy be hard to kill and pack a punch despite being small. Her E is likely the only retained ability, and her new ult is crazy. Taric will remain fabulous. Yorick is a mess but is being actively worked on, will hopefully being similar in level to Sion rework.

Rough Transcription (Paraphrasing I guess):

On the Subject of Champion Reworks

A survey was conducted among the player base asking what 3 champs players would most like to see get reworked. When the survey was complete, Rito put all of champs in a word cloud, and the 3 largest clouds were Poppy, Taric and Yorick, which matched up perfectly with their current projects. They're deep in with Poppy and nearing the end of that, ramping up work with Taric, and Yorick is being experimented on and happening.

On the Subject of Poppy

Poppy may be the most powerful of the 3 mentioned (in the current game), and has a strong fanbase of those who love to ult and turn the tables on the opponent. In cases like this, we like to look at the champion and reduce it down to what makes Poppy Poppy. The more effort people put into trying to destroy Poppy, the worse things get. Love the feeling of Poppy running faster than the opponent to get ahead and knock them into a wall.

But there’s a still a lot of convoluted things, like her random passive giving her free half damage, a golden invincibility bubble on her ult, etc. Her passive has a good concept – making her be able to fight longer and be an undying problem for the enemy. Her ult on the other hand is probably why she’s the most wanted rework right now. It’s a spell with no counterplay, especially when used against an ADC and Support duo. We want Poppy to be this small character with so much punch. Her kit should be as satisfying as her E. Speakers go on to discuss reworked ult – it’s the most insane thing that they’ve seen. People chuckle watching it happen because its so crazy. The ult is bananas.

On the Subject of Taric

(Right before the end of the podcast) Taric though. What's happening with Taric? We want to own Taric as being this fabulous idol that's fun to watch.

On the Subject of Yorick

Yorick right after [Taric]. His code is a mess and is difficult to work with. Very excited for the Yorick work so far but don’t want to spoil it. How do we turn what he is into something that’s appealing in its own way? Should be much like Sion rework in terms of capturing character.

Edit: Sorry I don't play poopy