As most already know, he got really sick and is still recovering form his illness. This has left Larian to use older tracks and some unreleased tracks to fill in the gaps.
If it is possible, I'd still like to hear his completed works that he planned on doing for the game even if they are to be released several months from now. His music I've found to be very inspiring and often "plays in my head" as a lot of it is very memorable.
An example is today I've gotten done a long and brutal foot race on a trail. This distance was about 12 miles with plenty of hills (like 3k+ foot elevation gain in total). Oddly enough a lot of the music that plays in my head has come from this composer. I don't run with head phones, especially on trail, because that is pretty much suicidal. I've finished as one of the top males in the race to the tune of quite a few of his tracks.
His music is more then just a game soundtrack for me and I'd still like to hear his completed works. It is always tragic when a music composer (or video game developer) cannot finish their compositions.
Get well soon Kirill! Looking forward to hearing your music in the future!