Not to mention that the game is like 90% reused assets from other games. I think they had to redo the UNI characters to make them more on line with the BB and P4 characters, but that's about it.
Not surprising, though. ArcSys has day one character DLC on new fighting games and almost always has yearly releases. DBFZ also announced a character season pass months ago and the game isn't even out yet.