So I see that Miki now likes Nail art. Miki really has changed a lot over the past year! XD
Yukiho's taken to blogging and Azusa's taken to wandering around sampling cafes (but we all knew that).
Just a quick glossing over the demo instructions.
(1) Time your appeals to the beat for more points.
(2) Each appeal has a multiplier attached to it, the longer you go without appealing to it, the larger it grows. As you appeal to a category, the multiplier drops. I'm not sure if they all start falling if you keep doing the same one over and over.
(3) Memory Appeals reset the multipliers, and you only have three.
(4) You can Burst Appeal when your Voltage maxes out. Voltage increases with Memory Appeals and Perfect Appeals.
Other notes: the video showed the group having a Lv. 3 Memory appeal. Other reports say that Memory Appealing and Burst Appealing decreases your opponent's Voltage.
EDIT: Found the article again, nothing said about Perfect Appealing decreasing the rate at which your rival gains Voltage. It was Burst Appealing.
I'm kinda wondering how versus is going to be. Right now, it looks like there's just one thing you need to do.
As far as guest characters go, I think they'll pop up on stage with you for the space of one Festa. Obviously, if you're up against Ryuuguu, I don't think you'd be able to have them join you. Otherwise, it's all good.