Been a LOT of discussions about this. I'll just pass on what I know.
Down at Adobe MAX in San Diego first few days of November, one of the Adobe video apps upper staffer said there has been NO decision as to what will happen with SpeedGrade, and there isn't even a scheduled time to discuss what will happen. He explained that currently it is on "hiatus" as a status, just like Audition was through three full cycles. At the end of that time, it was decided to re-cast Audition a bit and then a ton of effort was put into turning it into a nearly new program.
So, he said ... SpeedGrade could as easily come back vastly improved in another cycle or two. Or ... it might be determined at some point that it isn't part of their "future" and be allowed to go EOL ... "end of life". As someone who works with their applications and the movie industry, he added that it doesn't seem to him like Adobe wouldn't have any real grading program, but then ... such decisions are entirely possible. And it partly depends on how well Lumetri within PrPro "works" for the client base.
In other words, a lot of ... maybe ...
There's a colorist I know well, who was a teacher at MAX, and says that no matter that they've not made an announcement, he thinks it's already in the coffin. They just haven't announced a burial date & put it in the ground.
The Staffer said oh no, that's not true. Colorist rolled his eyes.
Take your pick.
I'm hoping they do an Audition with it and bring it back new & improved. A grading app is a very different beast than a grading tool in an NLE. And I've tested the total "holey snap" out of Lumetri, and I've got blog posts published & coming on how to best use it. There's some things it's really quite good at, especially if you use a control surface like the Tangent Ripple or spend the bigger bucks for the full Elements panel.
Neil