Three dancers - one lead and two backups - dance on the stage. There are three spots for players - one for each dancer. Xbox One version of Just Dance 2014 gives two spots for each dancer. Lyrics are centred and displayed above dancers (if playing on the World Dance Floor, they remain at their usual place).
I Kissed a Girl’s on stage mode is the only one where the backup dancers are of different genders.
Just Dance and #thatPOWER’s On-Stage Modes are the only ones where all three dancers are of the same gender.
When using a Wii, the player can't go home on the console's main menu while playing in On-Stage mode.
Applause has an alternate mode with the on-stage background, and the dancer lip syncs the song, but it's still not an actual on-stage mode.
The dancers of an on-stage mode always hold or touch each other one way or another. Usually it's all three dancers doing this, but there's times where the lead dancer does that to each of the backup dancers one at a time.
As seen on the official website, the mode was originally going to return in Just Dance 2015; however, it didn't appear in the final cut.