Tatsuin Games, the company helmed by Masahiro Yuge that manages the catalogue of the defunct arcade developer Toaplan, has released teaser trailers for the multiple projects they intend to reveal in full at TGS—as far as I can tell, the new games are internally-made, but they do seem to be planning a fairly substantial booth that they'll be sharing with M2, so we'll know for sure before long:
TATSUJIN EXTREME / TRUXTON EXTREME, a brand-new sequel to their vertical sci-fi shooter Tatsujin/Truxton and the infamously brutal arcade-only follow-up Tatsujin Ou/Truxton II—it's being made in collaboration with former Toaplan/Cave designer Junya Inoue and they're touting it as "a fusion of shooting games and comics", whatever that means; it also looks to be 16:9 vertizontal which... no. It's being made for PS5 (other platforms TBD) and while it's still in active dev, they're aiming to have it out next year:
SNOW BROS. WONDERLAND, a reimagining of their fixed-screen arcade game as some sort of vaguely puzzle-y 3D overhead action game with cutesy character designs and VA by prominent actors (Afumi Hashi, Yuri Noguchi, Yuyiko Fujii & Satoshi Tsuruoka); it's coming to Switch/PS next year:
Amusement Arcade Toaplan, a smartphone app in the vein of Capcom's recent Arcade Stadium releases that'll allow you to purchase emulated versions of 25 classic Toaplan arcade games (which include regional variants), with a customisable virtual arcade front-end; it comes with Tatsujin/Truxton for free, with trials for Tiger Heli, Flying Shark, Wardner, Teki Paki and Snow Bros.:
idk why Tatsujin pulled all the EN trailers but left the JP trailers up, but I swapped em out for ya