some nice details from the interviews with Makoto Osaki (creative producer of Project DIVA series) and Keiichi Matsunami (director of Project DIVA MEGA39s):
- SEGA holds a meeting once a month to discuss any present and future plans (note, this is not only about games, but also concerts, goods, etc..)
- Project DIVA MEGA39s has been made to celebrate the 10th anniversary of the series. Nintendo Switch has been chosen as a platform because Project DIVA originally was on PSP, so a return to portable is a good way to celebrate such important anniversary
- the new Mix Mode is aimed at younger audience, but everyone can enjoy it. Osaki-san and Matsunami-san remember fondly how great was Project Mirai series, born as a series for younger audience, and then all fans loved it
- Mix Mode has a Support Mode that helps pressing the buttons at the right time, so you can enjoy the game more. The Easy mode requires only one Joycon to tilt
- the staff has fixed the Mix Mode for the trial version of Tokyo Game Show. the version playable at Magical Mirai 2019 in Tokyo had some problems with the Joycons
- The basic rule of Mix Mode is that red goes to the right and blue goes to the left, but there are exceptionally crossing notes, so you can make quite difficult places in Hard difficulty
- difficult songs weren't available in the trial version because Osaki-san wanted the fans to simply enjoy the new game
- there is no Extreme difficulty (Easy, Normal and Hard), but some Hard songs feel like more Extreme, and Osaki-san remembers that some songs of Project Mirai 2 in Hard mode were quite difficult to complete or to get a good score
- the traditional Arcade Mode has some adjustments compared to Future Tone
- in terms of framerate, Future Tone DX runs at 60 fps, MEGA39s runs at 30 fps, but with the anime style and the new shadows and lights, it feels more like 60 fps
- fans must see Future DX like the definitive version of Project DIVA, while MEGA39s is the perfect way to enjoy the series on the go and also with a new graphics style and gameplay adjustments for everyone can enjoy and play it
- the t-shirt accessory module can be customized thanks to the Switch touch screen. since Project DIVA MEGA39s is aimed also at children, Osaki-san imagines that many children will enjoy drawing on the t-shirt and then see it in the PV
- Matsunami-san also added "we want to make the title loved by many people for a long time."
- PVs have been completely reviewed, because the new cel-shading style make everything different. for example, in some PVs, the nose or the mouth couldn't be seen without an adjustment of the shadows and lights of the stage
- the new 10 songs have been chosen following 2 themes: recent songs and famous producers that are in the history of the series
- some songs weren't selected because they weren't easy or fun to play in the Mix Mode
- the dedicated controller has been engineered together with the original Project DIVA Arcade team
- the notes shape can be customized
- about the future of the series, Osaki-san said "it is the time when “soul and calculation” are necessary". now they are focusing to make Project MEGA39s a good title with a solid result, and then the next title should come out naturally.