It doesnt look like a new member,they new members teasers are always animated with the vtuber that joins in it(Kson,Nazuna,Haruka,Henya) so it looks like a concert to me.I guess they finally realized that just streaming isnt the path so they are going to "try" something new.
But here are a few questions:How is Mouse going to sing without dying?she is very good but she doesnt sings that often due to her condition.
Kson is out of form and sometimes it looks like she forgot what was teached in Holo but still she is better than the rest(hopefully)
Afaik Hime,Froot,Henya,Melody and Haruka cant sing and dance.
I dont need to explain Nazuna do i?She is out of practice but her few Karaoke streams as Mikeneko show that she still has it.Now the only question for her is how much effort is she going to put on this?Voice ore is pretty small but it has the atmosphere she always wanted with no Males.
Now the elephant on the room:
HOW THE FUCK IS ZENTROON GOING TO SING????