The official website just updated and the wording they used was a whole lot more clear than Famitsu.

It says that if you hit a monster with an attack you get a double note instead of a single, and if you play a song formed of double notes it encores the last song you played.

From me:

What they are doing is encouraging people to stop playing in the air. Instead of giving a demerit for playing in a safe area away from the monster they are going to reward those who attack as they play. This is how i play so I’m hyped!!

This means if you are pretty confident you won’t whiff you can skip an encore for one song and just double at it with the next song, making for less openings and letting you play more aggressive!

I am….beyond hype