So it looks like, according to her live concert last night, Saori@destiny and Aira Mitsuki are releasing a collaboration album called "PARK OF THE SAFARI" on the 7th of December. It looks like it'll be a full album, with both solo songs and duets, so there's something for both Aira and Saori fans in there.
It'll have a safari theme (obviously), though the genres seem a little uncertain, because I've seen mention of everything from techno to dance-pop to soul and chillwave... So I don't know what's going on there. But still, NEW ALBUM, HELL YEAH!
Also, if you go to the recorded stream of Saori's concert here
, and go to about an hour and two minutes in, there's a preview of one of the new songs that sounds like it's an Aira solo playing behind their MC about the album.