Well if it was in the Beta software, one cannot rule out it's later appearance.
I don't have one yet but will shortly.
I asked exactly this question upon it's release, about the notions of Profiles, and ICC profiles. Something seems unclear in the naming and function. I am glad Andrew showed the existence, that leaves us to believe that it is doable.
I also agree , and support DNG for camera makers from the get go. Time is going by and I wish we could all get on with a standard format.
Since my workflow has changed over to mostly LR, DNG makes sense, but only if everyone makes it happen.