I would have to wonder what kind of layout the arcade machine would use for battle... perhaps it could use a modified Soul Calibur or Street Fighter game machine, and for two players, two separate screens...

I would also like to see out-of-breath "continue?" countdown screens, and save the falling down for a "game over," as well as recovery actions for retries, similar to those in Street Fighter IV.

YouTube - Street Fighter 4 All Game Over Animations

YouTube - Street Fighter 4 All Retry Animations