Some Puyo Puyo thing would be my guess.
Sakurai giving an in depth look at Puyo Puyo for 20 minutes.
10 minutes early footage of some Puyo Puyo character he's developing.
"I've also wanted this character in my game. Look at that B-Special!"
"I'm still playing alone with two controllers. No one at the office wanted to play with me at this hour"
"To be fair I'm kinda lonely in general but that's where Puyo Puyo comes in right?"
Wait, what's that? Tetris block too? Find out next time!