Yes , right now it is, IIRC, Mono based but it is advertised as "Meadow: Full-stack .NET Standard IoT platform." and it would seem a great fit with less fragmentation.
I wonder when Meadow will work with .NET Standard as advertised?
From the landing page:
Runs full .NET Standard 2.0 Libraries.
Updateable over the air.
Complete documentation with great guides and samples.