This is what I've been waiting for for years. Stabilized primes are the way to go. As good as the new fast primes of the past years have been from Sigma etc, they are all not the perfect solution for eternity because of missing stabilization.
Of course it's also highly welcome for video. And if you look at a Batis 85/1.8 that has stabilization coming from a Sony body and from inside the lens, each huge bulky DSLR 85mm without any stabilization looks like a less useful tool from an old era.
As good as the Otus 85 and equally good Milvus 85 are, in the end I tend to use them only for tripod landscape work. No stabilization and no autofocus is very limiting, and the handheld the advantages of the great optics are eliminated fast because of that.
I also don't think anybody needs to wait for a Sigma Art 85. The recent Sigma 85/1.4 beats all Canon and Nikon 85mm lenses and seemed to be the first lens that was designed by the new engineers behind the Art label, that Sigma just started a bit later than the release of their 85mm. I am sure Sigma will come out with an update of that lens soon, but more because the buyers need the signal "now it's Art branded", and not because the quality step from the old lens model will be as huge as in the case of their older 20, 35, 50 etc models which really had designs that where not done by the engineers behind Art.