Edit: all 50 games (including the 10 that come with any bundle/purchase of the trackball/knob controller) are now listed on the games page. TONS OF GEMS!
Reading into this some more with google translate, damn it's gonna be costly in Japan. There's some "first print" edition that has various extras like music albums and printed manual/art for all games to stick in the cabinet's extra insert. The cheapest basic package is like ~130 euros and the most expensive with all extra controllers (the trackball/knob controller also comes with an SD card with 10 more games meant for those inputs bringing the total to 50) is like ~380. The controllers also cost like 70~90 separately except the gamepad which costs ~22 so I guess they should all be pretty high quality arcade-like to justify it...Hot little Taito arcade. Love details like the rotating screen. Well, it's far from a detail. The extra controls with the trackball, rotation knob or whatever it's called etc. seem to be among the sold separately controllers that connect via cable rather than attach. I still wish it was just a tad bigger., the screen is a 5 inch 4:3.
Some great games like Elevator Action Returns and The NewZealand Story for a total of 40 (+ 10 to somehow be released for sale post-launch or something)! Edit: it says you can add games from the SD card slot. Even if officially it only accepts Taito arcade roms it'll probably be hacked super easily for much more...