From seeing that video clip it certainly looks more flashy, showing the rival's bursts etc makes it a bit more like your actually competing in the audition. As far as what to do, I don't think its that far off the usual, just hitting the button shown in the centre to make the appeal.
What I find interesting is which idol is doing it, so it appears you can switch idols, so use one for maximum visual impact and another for max vocal - is this new or did the original IM@S do that? (I only have SP so I don't know how it worked with more than 1 idol). Given that the player in the video 'lost' is the the score and status etc on the right the rival's stats?
I can't see anywhere the judges status, like in SP if you appeal to much to one judge they walk out, that doesn't appear to be there, and noting the voltage and score elements, is it more fan/audience orientated like L4U I wonder?
On a slightly different note, it appears you take 3 idols, and you can add in 2 your not producing, which can include Ritsko's idols, therefore if you take 2 of hers, what happens when your auditioning? Do those 2 not support you ? - which would defeat the point of it, or does it mean she has to pick 2 others to go against you? I'm wondering if there's a potential tactic in that. I only see 3 in the screen-shot however, so maybe this unity is only for the TV performance?