Currently they support both - il2cpp isn't done yet. But as the blogpost calls it, it is the future of scripting in Unity.
Also, yes, this is a replacement for the VM and AOT, but the libraries in Mono are still very useful. Many of them are currently being replaced by Microsoft code as well, though, so it looks like .NET, Mono and il2cpp will share lots of code that way. Just not the VMs.
Comments
Currently they support both - il2cpp isn't done yet. But as the blogpost calls it, it is the future of scripting in Unity.
Also, yes, this is a replacement for the VM and AOT, but the libraries in Mono are still very useful. Many of them are currently being replaced by Microsoft code as well, though, so it looks like .NET, Mono and il2cpp will share lots of code that way. Just not the VMs.