Im not really knowledgeable in these things but from what Im understanding it looks like Federation VS Zeon DX is being restored?
If someone who understand this stuff and is smarter than me whats to sift through the random link I ended up at Id love to hear what your thoughts are. It seems like they its planned to be implemented via an emulator (?) Again just my speculation of what Im reading from the github.
Heres the link: https://github.com/inada-s/gdxsv
I can only hope this becomes another step in fully restoring online to the dreamcast!