Calli got a new song tommorow.
And coincidentally HoloEN Xitter RT'd this.
So from what I skimmed through, its either:
- Hololive talent that has interest to MGS (Pekora, for one)
- Calli
- Nijisanji talent that has interest to MGS (Pomu)
- Neither and it's actually just them launching a completely new vtuber who dressed up like Snake.