Following a couple of teasers by Sega (one on the Steam page for Bayonetta, another on the Steam page for Valkyria Chronicles), they have now confirmed that Puyo Puyo Tetris is coming to Steam with the release of a trailer.
There are numerous gameplay modes, such as the single player Adventure, Challenge and Endurance modes. Or you can play against others in Versus, Multiplayer Arcade (with up to four players locally or online), Swap (players compete on both Puyo Puyo and Tetris boards that switch back and forth) and Fusion (players compete with Puyos and Tetriminos together on the same board). There is also the option of playing with the original Japanese voiceovers (with subtitles).
The game was released in Europe on PS4 and Nintendo Switch in April 2017. Puyo Puyo Tetris hits Steam on 27 February 2018. There are exclusive wallpapers and avatars too for those who pre-order.