It's one of my priorities for my project Ephestos, but is a low priority. Meaning 5 - 6 years down the road.
The technology needs work, but I keep an eye on it.
Another thing is that I would prefer something on GPL or at least MIT license.
On the other hand nothing stops you from making a Pharo SDK for it. Why not give it a try ?
It would be fantastic if there were a Pharo SDK for Meta which is
powered by Unity (https://www.metavision.com/). Augmented Reality is all
about direct interaction -- the very paradigm of Smalltalk itself.