The steam page for TGM4 is up!! They're just gonna release it!! You don't have to pore over maps of known arcade cabinets or do emulation on the Switch or anything weird!! You can just buy it! You can plug in a fightstick!!
https://store.steampowered.com/app/3328480/TETRIS_THE_GRAND_MASTER_4_ABSOLUTE_EYE/
https://store.steampowered.com/app/3328480/TETRIS_THE_GRAND_MASTER_4_ABSOLUTE_EYE/
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https://web.archive.org/web/20221201140929/https://twitter.com/Taito_Hey/status/614275585771114496
Other than that, most of the game modes seem to have been redesigned.