SEGA has announced the release date for the next two DLC packs for Hatsune Miku: Project DIVA Mega Mix.
The second pack will include the 6 new tracks and 5 costumes, while the third pack will include 6 new tracks and 3 costumes. Both packs will release on March 13th 2020 in Japan. More details about the new tracks and costumes can be found here.
Hatsune Miku: Project DIVA Mega Mix is currently available for Switch in Japan, and is due to launch in the West some time later this year.