Couldn't make it.

Wanted to go though.
But you can see from the instruction sheets that there are 6 playable characters: Alex, Kei, Maria, Sophia, Lilith and Caladrius, which lines up with what is available as DLC for the game at the moment.
I'm curious what type of arcade features it will have. I would think online Leaderboards would be bottom line, considering how ahead of the pack Crimzon Clover is with all its stuff, and this is technically a competing title. There was actually an interview with the Caladrius director in the latest Arcadia where he mentioned that he wanted to develop the arcade version so "people would be glad they played it in the arcade", which to me sounds like some original features or characters.
We'll see. Incidentally that article says the Caladrius arcade version is "currently released", but that is not the case. Official Twitter is saying early summer.