All details are available in the release notes. The version 2.0 update will be released as a balance adjustment available for all players. Version 2.0 Expansion Pack also offers a brand new storyline, as well as new interactions and character colors. Players who do not purchase the Version 2.0 expansion pack will still be able to play against the 2.0 expansion pack characters during online matches.
A separate "Version 2.0 Expansion Pack", which will accompany the update, will be available for $ 24.99 and will include the following nine new fighters:
- Yumi (Senran Kagura: Summer Versus)
- Neo Politan (RWBY)
- Akatsuki (Akatsuki Blitzkampf)
- Blitztank (Akatsuki Blitzkampf)
- Celica (BlazBlue: Central Fiction)
- Elizabeth (Arena Persona 4)
- Tohru Adachi (Persona 4 Arena Ultimax)
- Hilda (Under the night in birth)
- Susanoo (BlazBlue: central fiction)
patch notes:
https://arcsystemworks.com/blazblue-cross-tag-battle-2-0-update-notes/
https://www.blazblue.jp/tag/img/upd200_en.pdf