Today Arika released an video update detailing more about their plans in the first half of 2019, along with showing Sharon's gameplay:
▼Early January 2019 Schedule Planning to have an update: mainly fixing arcade version. Attacks and systems will be adjusted slightly.
▼Mid-February 2019 Schedule It is one month before "Toushinsai -闘神祭-" (japanese tournament), but we are planning to take the courage to have a game adjustment. (Details are yet to be determined.) Planning to add more songs in the game
▼Late March 2019 Schedule Plan to release 1 additional character for free.
After that, we plan to add 2 characters by the end of May. Whether releasing 2 characters at the same time, or one at a time is yet to be determined.
The remaining two characters are most likely Area (free character) and Terry Bogard (the paid one).